Film formulations containing dexmedetomidine and methods of producing them

ABSTRACT

Disclosed herein is a self-supporting, dissolvable, film containing dexmedetomidine or a pharmaceutically acceptable salt thereof. The film is administered orally to treat various conditions, particularly agitation, by transmucosal delivery of the active agent.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No. 17/579,914, filed Jan. 20, 2022, which is a continuation of U.S. patent application Ser. No. 17/103,013, filed Nov. 24, 2020, which is a continuation of U.S. patent application Ser. No. 16/931,630, filed Jul. 17, 2020 (U.S. Pat. No. 11,478,422, issued Oct. 25, 2022), which is a continuation of U.S. patent application Ser. No. 16/453,679, filed Jun. 26, 2019 (U.S. Pat. No. 10,792,246, issued Oct. 6, 2020), and claims the benefit of priority to U.S. Provisional Application Nos. 62/690,407, filed Jun. 27, 2018; 62/693,726, filed Jul. 3, 2018; 62/767,422, filed Nov. 14, 2018; 62/787,649, filed Jan. 2, 2019; 62/798,842, filed Jan. 30, 2019; and 62/849,747, filed May 17, 2019; each of which is herein incorporated by reference in its entirety for all purposes.

FIELD OF THE INVENTION

Disclosed herein is a self-supporting, dissolvable, film containing dexmedetomidine or a pharmaceutically acceptable salt thereof. The film is administered orally to treat various conditions, particularly agitation, by transmucosal delivery of the active agent. The film is formulated to produce a rapid onset of action without the significant sedation normally associated with the administration of dexmedetomidine.

BACKGROUND OF THE INVENTION

On Dec. 17, 1999, the U.S. Food and Drug Administration approved a dexmedetomidine product, PRECEDEX®, formulated as an intravenous solution for continuous infusion, and indicated as a sedative agent for initially intubated and mechanically ventilated patients during treatment in an intensive care setting. PRECEDEX® was later approved as a sedative agent for non-intubated patients prior to and/or during surgical and other procedures.

In addition to its use as a sedative, dexmedetomidine also has analgesic and anti-agitation properties. However, to date, it has not been possible to develop a formulation comprising dexmedetomidine for use as an anti-agitation agent. For example, PRECEDEX® is not a suitable anti-agitation agent for the following reasons: it can presently only be administered in an enrolled healthcare facility to patients; the ability to titrate the dose to suit individual patient requirements is challenging; self-administration is generally impractical since PRECEDEX® is administered as an injection; and its significant sedative properties can be undesirable in many settings to treat agitated subjects.

A continuing, unmet need exists for non-addictive anti-agitation medicines. A dexmedetomidine-based medicine that could be self-administered, e.g. orally, to produce rapid relief from agitation without significant sedation would be highly valuable addition to agitation treatment options. However, administering dexmedetomidine orally to provide fast relief from agitation is challenging. For example, sublingual tablets have a tendency to be swallowed before complete dissolution and trans-mucosal delivery, leading to wastage of active substance due to hepatic first pass metabolism. As a result, sublingual tablets may not achieve therapeutic levels of dexmedetomidine in the blood plasma. Oral sprays, especially for sublingual delivery, also have deficiencies, such as dose inaccuracy, swallowing of drug, the need for frequent dosing, patient non-compliance, and cost of goods. In addition, significant cardiovascular side-effects have been shown to occur in human subjects treated with dexmedetomidine hydrochloride when administered as a sublingual spray (see International Patent Application Publication No. WO 2010/132882). WO 2010/132882 teaches than, when dexmedetomidine hydrochloride was administered sublingually or administered by IV, a significant number of subjects experienced hypotension post-administration together with an undesirably high level of sedation. Hypotension was observed at a sublingual dose of 100 micrograms dexmedetomidine and, to a lesser extent, at 50 micrograms. These, and other, limitations taught by existing dexmedetomidine formulations have disincentivized the development of an oral dexmedetomidine formulation to treat agitation. However, the inventors of this application have now surprisingly discovered a new oral film formulation which can be administered to treat agitation without the aforementioned limitations.

SUMMARY OF THE INVENTION

The disclosure provides a self-supporting, dissolvable, film comprising dexmedetomidine or a pharmaceutically acceptable salt thereof, one or more water-soluble polymers, and, optionally, one or more pharmaceutically acceptable carriers. The film is formulated to release dexmedetomidine rapidly, enabling dexmedetomidine to be absorbed transmucosally to provide effective anti-agitation relief for patients within minutes, without concomitant significant sedation.

In one embodiment, the disclosure provides a pharmaceutical film composition suitable for sublingual administration, comprising, or consisting essentially of, a therapeutically effective amount of dexmedetomidine or a pharmaceutically acceptable salt thereof, a polymer component consisting of one or more water-soluble polymers; and, optionally, one or more pharmaceutically acceptable carriers.

In one embodiment, the disclosure provides film formulations comprising a polymer-based film substrate (e.g. a drug-free polymer matrix film) containing on the surface of the substrate dexmedetomidine or a pharmaceutically acceptable salt thereof. Dexmedetomidine or a pharmaceutically acceptable salt thereof may be conveniently applied to the surface of the film substrate as part of a composition also comprising a liquid carrier, and optionally a polymer component and/or one or more additional pharmaceutically acceptable carriers (hereinafter referred to as the “dexmedetomidine composition”).

The dexmedetomidine composition may, in one aspect of this disclosure, be applied to the film substrate as a single droplet or multiple droplets at one or more specific substrate locations, or alternatively through discrete deposition (e.g. micro-deposition) of the dexmedetomidine composition at isolated locations on a common placebo film.

In another aspect, the disclosure provides film formulations comprising a polymer-based film substrate (e.g. a drug-free polymer matrix film) onto the surface of which is stenciled the dexmedetomidine composition at one or more discrete locations.

In another aspect, the dexmedetomidine composition may be present on the surface of the film substrate, after drying, as one or more discrete lines. The line(s) may be applied using either a direct deposition or stenciling method.

In some embodiments, the substrate is formed as a continuous web of film, which may be cut into smaller individual films following deposition of the individual units of the dexmedetomidine composition and drying.

One advantage of such films is the ability to deposit a high concentration of dexmedetomidine onto the surface of the “placebo” substrate for rapid trans-mucosal delivery of dexmedetomidine. Another advantage is that the use of individually formed doses limits variation of the active ingredient between dosage units. Particularly in the case when the surface of the film substrate is stenciled with the dexmedetomidine composition, advantages include the ability to deliver readily an appropriate thickness of dexmedetomidine composition onto the surface of the film. Still another advantage of the deposition method includes the ability to incorporate a combination of dexmedetomidine or a pharmaceutically acceptable salt thereof and one or more additional actives into a single unit dose, even if the active ingredients would otherwise be incompatible with one another, through discrete deposition of those active ingredients at separate locations on the substrate. Yet another advantage is the avoidance of yield losses associated with conventional dissolvable film production processes. Because the formulations used to create the film generally contain relatively expensive pharmaceuticals, these yield losses represent a significant cost.

In a further embodiment, the disclosure provides film formulations comprising dexmedetomidine or a pharmaceutically acceptable salt thereof disposed within a polymer matrix, e.g. wherein dexmedetomidine or a pharmaceutically acceptable salt thereof is substantially uniformly distributed throughout the film.

The disclosure also provides processes for preparing films of the present disclosure. In one process, a film is produced in which dexmedetomidine or a pharmaceutically acceptable salt thereof is disposed (e.g. substantially uniformly distributed) within a polymer-based film. In another process, a film is produced in which dexmedetomidine or a pharmaceutically acceptable salt thereof is present on the surface of a polymer-based film substrate.

Also disclosed herein, as embodiments of the disclosure, are solutions or suspensions containing dexmedetomidine or a pharmaceutically acceptable salt thereof suitable for depositing onto the surface of the polymer-based film substrate (i.e. the “dexmedetomidine compositions”).

The disclosure also provides methods of treating agitation in a human by administering the films disclosed herein. Various conditions requiring anti-agitation therapy may be treated by sublingual administration of a film disclosed herein, including agitation associated with neurodegenerative and neuropsychiatric diseases, particularly in non-institutionalized patients. The treatment provides effective non-coercive anti-agitation therapy with adequate safety profile, and favorable tolerability, thus mitigating the risk of high blood pressure/respiratory depression.

The administration of a film composition of the present disclosure to a patient suffering from agitation substantially reduces the risk of violence and injury to the patient and others by preventing the condition from worsening and/or limiting the duration and severity of the agitation outburst. The film compositions of the present disclosure are especially useful in managing acute agitation events. They can also be safely administered either in a clinical facility or outside of a clinical facility.

These and other features, advantages and objects of the various embodiments will be better understood with reference to the following description of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 : shows a cross-sectional (side) view and area (top) view of an exemplary monolithic drug-containing matrix film disclosed herein.

FIG. 2 : shows a cross-sectional (side) view and area (top) view of an exemplary micro-deposited matrix film disclosed herein.

FIG. 3 compares the diffusion of dexmedetomidine film formulations disclosed herein (represented by Formulations 1 to 7 and Formulation 11 of Example 1 hereinafter) through an oral cell culture membrane versus the diffusion of PRECEDEX®.

FIG. 4 shows the mean dexmedetomidine plasma log concentration vs. time for dose levels 10, 20 and 40 mcg of dexmedetomidine sublingual film (Semi-log scale). Error bars represent 1 standard deviation.

FIG. 5A: depicts individual dexmedetomidine concentration-time profiles for all subjects by dose after administration of dexmedetomidine sublingual film (10 mcg) Semi-log Scale. Dexmedetomidine sublingual film is exemplified in Example 1, Formulation 12.

FIG. 5B: depicts individual dexmedetomidine concentration-time profiles for all subjects by dose after administration of dexmedetomidine sublingual film (20 mcg) Semi-log Scale. Dexmedetomidine sublingual film is exemplified in Example 1, Formulation 12.

FIG. 5C: depicts individual dexmedetomidine concentration-time profiles for all subjects by dose after administration of dexmedetomidine sublingual film (40 mcg) Semi-log Scale. Dexmedetomidine sublingual film is exemplified in Example 1, Formulation 12.

FIG. 6 : depicts mean VAS/S score vs. Nominal Time after administration of dexmedetomidine sublingual film (10, 20, 40 mcg) and Placebo. Dexmedetomidine sublingual film is exemplified in Example 1, Formulation 12.

FIG. 7 : depicts standing Systolic BP vs Nominal Time after administration of dexmedetomidine sublingual film (10, 20, 40 mcg) and Placebo. Dexmedetomidine sublingual film is exemplified in Example 1, Formulation 12.

FIG. 8 : depicts supine Systolic BP. vs Nominal Time after administration of dexmedetomidine sublingual film 10 mcg, 20 mcg and 40 mcg and Placebo. Dexmedetomidine sublingual film is exemplified in Example 1, Formulation 12.

FIG. 9 : depicts standing Diastolic BP vs Nominal Time after administration of dexmedetomidine sublingual film 10 mcg, 20 mcg and 40 mcg and Placebo. Dexmedetomidine sublingual film is exemplified in Example 1, Formulation 12.

FIG. 10 : depicts supine Diastolic BP vs Nominal Time after administration of dexmedetomidine sublingual film 10 mcg, 20 mcg and 40 mcg and Placebo. Dexmedetomidine sublingual film is exemplified in Example 1, Formulation 12.

FIG. 11 : depicts pulse Rate vs Nominal Time after administration of dexmedetomidine sublingual film 10 mcg, 20 mcg and 40 mcg and Placebo. Dexmedetomidine sublingual film is exemplified in Example 1, Formulation 12.

FIG. 12 : depicts the percentage of schizophrenic patients achieving RASS −1 in the treatment arm (IV dexmedetomidine hydrochloride treated group) versus placebo group.

FIG. 13 : depicts the reduction in PEC score with time in schizophrenic patients in the treatment arm (IV dexmedetomidine hydrochloride treated group) versus placebo group.

FIG. 14 : depicts the maximum doses of IV dexmedetomidine hydrochloride received by schizophrenic patients for the treatment of agitation.

FIG. 15 : depicts the total intravenous dose of dexmedetomidine hydrochloride received by schizophrenic patients for the treatment of agitation.

FIG. 16 : depicts the mean Plasma concentration (pg/ml) vs actual time in schizophrenic patients treated with dexmedetomidine hydrochloride.

FIG. 17 : depicts the mean (±SD) dexmedetomidine plasma concentration-time, sorted by dose level (Linear Scale)

FIG. 18 : depicts the mean (±SD) dexmedetomidine plasma concentration-time, sorted by dose level (Semi-log Scale)

FIG. 19 : depicts the mean (±SD) change in PEC Score from baseline in schizophrenic patients treated with dexmedetomidine hydrochloride (120 mcg) versus pooled placebo group

FIG. 20 : depicts the mean (±SD) percent change in PEC Score from baseline in schizophrenic patients treated with dexmedetomidine hydrochloride (120 mcg) versus pooled placebo group.

DETAILED DESCRIPTION Abbreviations

-   AD: Alzheimer disease; -   AUC: Area under the curve; -   AUC_(last): area under the curve, calculated to the last observable     time point; -   C_(max): maximum plasma concentration; -   CT: Computed tomography; -   DPBS: Dulbeccos phosphate-buffered saline; -   DLB: Dementia with Lewy bodies; -   FTD: Fronto temporal disease; -   HPC: Hydroxypropyl cellulose; -   IPD: In-patient Departments; -   MW: Molecular weight; -   MRT_(last): Mean residence time, calculated to the last observable     time point; -   MRI: Magnetic resonance imaging; -   mm: Millimeter; -   OPD: Out-Patient Department; -   PANSS: Positive and Negative Syndrome Scale -   PEC: PANSS Excitement Component -   PEO: Polyethylene oxide; -   PD: Parkinson disease; -   PTSD: Post-traumatic stress disorder -   RASS: Richmond Agitation Sedation Scale -   TEER: Transepithelial electrical resistance; -   T_(max): Time of maximum plasma concentration -   Wt %: Weight percentage

Definitions

It will be understood that the term “film” herein includes thin films, sheets and wafers, in any shape, including rectangular, square, or other desired shape. The film may be of any desired thickness and size, such that it can be conveniently placed sub-lingually in the patient. For example, the film may be a relatively thin film having a thickness of from about 20 micrometers to about 200 micrometers, or may be a somewhat thicker film having a thickness of from about 20 micrometers to about 1000 micrometers. In certain embodiments, the film may be even thicker, e.g., having a thickness greater than about 30 millimeters.

As used herein, the phrase “water-soluble polymer” refers to (i) a polymer that is at least partially soluble in water, and desirably fully or predominantly soluble in water, and/or (ii) a polymer that absorbs water. Polymers that absorb water are referred to herein as water-swellable polymers. Suitable polymers include polymers that are water-soluble at room temperature and other temperatures, such as temperatures exceeding room temperature. Moreover, suitable polymers include polymers that are water-soluble at pressures less than atmospheric pressure. Desirably, water-swellable polymers have at least a 20 percent by weight water uptake, e.g. a 25 or greater percent by weight water uptake. In one embodiment, film formulations comprise one or more water-soluble polymers that promote the dissolution of the film upon contact with oral mucosal fluids.

The terms “formulation” and “composition” are used interchangeably, except where otherwise clearly intended to have different meanings.

The term “pharmaceutically acceptable carrier” refers to a pharmacologically inert substance to be used as a carrier. As used herein, the phrase “carrier” and “excipients” are used interchangeably, except where otherwise clearly intended to have different meanings.

As used herein, the term “monolithic” in the context of a film composition, refers to a single layer polymer film as a “placebo” film matrix or a drug-containing film matrix. In some aspects, a monolithic film is used as a drug-free film matrix intermediate product in the preparation of a drug micro-deposited matrix film composition.

As used here, the term “dosage form” refers to a film composition in a portion that delivers a single dose, in a single administration, to a subject.

The term “self-supporting” means the films herein maintain structural integrity upon handling without the need for a backing layer. Some flexibility in the film is contemplated and may be desirable.

The term “dissolvable” means the films herein are readily disintegrated, e.g. at least within about 20 minutes, following administration to the oral mucosa. Disintegration is achieved by saliva and/or other aqueous materials on the mucosal surface.

The term “without significant sedation” and the like means that the patient experiences a level of sedation not greater than Level 3 on the Ramsay Sedation Scale. Level 3 means sedated, but responds to commands. In certain aspects, the dexmedetomidine may be dosed to achieve a Richmond Agitation Sedation Scale (RASS) of −1 (“light sedation”).

As used herein, “about” means plus or minus 10% of the indicated numerical value.

As used herein, the phrase “disposed within a polymer matrix” means that dexmedetomidine or a pharmaceutically acceptable salt thereof is incorporated directly into the polymer solution prior to the formation of the solid polymer matrix film composition.

As used herein, the phrase “deposited on the surface of a polymer matrix” means that dexmedetomidine or a pharmaceutically acceptable salt thereof is formulated as liquid composition separate from the preparation of the solid polymer matrix, and deposited onto the solid polymer, e.g. as one or more micro-deposits, where it dries. The dried product is sometimes referred to herein as the “micro-deposited matrix film”. The drug liquid formulation may be in any form, including as a solution, emulsion, suspension, or dispersion.

Film Compositions:

The present disclosure provides pharmaceutical film compositions comprising, or consisting essentially of, dexmedetomidine or a pharmaceutically acceptable salt thereof, as an active agent, a polymer component, and optionally one or more pharmaceutically acceptable carriers. The disclosed film compositions have desirably functional attributes for sublingual administration. In particular, the disintegration time of the film compositions is such that the or mucosal delivery of dexmedetomidine or a pharmaceutically acceptable salt thereof is effective to rapidly treat agitation in a subject. For example, the film compositions may conveniently disintegrate completely sublingually in about 15 seconds to about 180 seconds, for example, about 30 seconds to about 180 seconds, including about 120 seconds. Disintegration times in about this time-frame assist in optimal sub-lingual delivery of the drug and in optimal onset of drug effect.

Active Agent

Dexmedetomidine has the IUPAC name (+) 4-(S)-[1-(2,3-dimethylphenyl)ethyl]-1H-imidazole. As the monohydrochloride salt, it is predominantly used as a medication for the sedation of patients during treatment in an intensive care setting or to sedate patients prior to and/or during surgical and other procedures. Such medication is currently sold under the registered trade name “PRECEDEX”.

Pharmaceutically acceptable salts of dexmedetomidine that may be used in the film compositions disclosed herein include generally any suitable salt that has been or may be approved by the U.S. FDA or other appropriate foreign or domestic agency for administration to a human. Non-limiting examples of suitable pharmaceutically acceptable salts include salts of inorganic acids such as hydrochloric, hydrobromic, nitric, carbonic, monohydrocarbonic, phosphoric, monohydrogen phosphoric, dihydrogen phosphoric, sulfuric, hydrogen sulfuric, and hydroiodic acid. Other examples include salts derived from non-toxic organic acids, including acetic, propionic, isobutyric, maleic, malonic, benzoic, succinic, suberic, fumaric, lactic, mandelic, phthalic, benzenesulfonic, p-toluenesulfonic, citric, tartaric, and methanesulfonic acids, or combinations of these acid salts. Exemplary salts include dexmedetomidine hydrochloride, dexmedetomidine hydrobromide, dexmedetomidine sulfate, dexmedetomidine sulfonate, dexmedetomidine phosphate, dexmedetomidine nitrate, dexmedetomidine formate, dexmedetomidine citrate, dexmedetomidine tartrate, dexmedetomidine malate, dexmedetomidine benzoate, dexmedetomidine salicylate, dexmedetomidine ascorbate or the like. In other embodiments, deuterated forms of dexmedetomidine or a pharmaceutically acceptable salt thereof may be included in the film composition.

Dexmedetomidine or a pharmaceutically acceptable salt thereof may conveniently comprise about 0.01% to about 50%, e.g. about 0.05% to about 30%, e.g. about 0.05% to about 20%, e.g. about 0.05% to about 3% weight/weight (w/w) based on the total weight of a film composition on a dry weight basis. However, it will be appreciated that, when the film composition is a micro-deposited matrix film, the w/w % of dexmedetomidine or a pharmaceutically acceptable salt may vary from the afore-mentioned percentages depending on the total dimensions (and therefore total weight) of each unit dose of film.

In one aspect, dexmedetomidine or a pharmaceutically acceptable salt thereof may be present at about 0.05 mcg to about 3 mcg for each 100 mcg of unit dose total weight of film composition.

The film formulations disclosed herein comprise dexmedetomidine or a pharmaceutically acceptable salt thereof either (i) disposed within a polymer matrix or (ii) deposited on the surface of a polymer matrix, e.g., on the surface of a “placebo” film.

Further, dexmedetomidine or a pharmaceutically acceptable salt thereof may be incorporated as part of a film composition in a taste-masked form. In this embodiment, particles of drug may be coated or granulated with a taste-masking agent, for example a polymer, oil, or wax.

Polymer Component

The polymer component consists of one or more water-soluble polymers. The polymer component is present in the film composition in a sufficient amount to ensure disintegration of the subsequently formed film matrix is achieved in the oral mucosa within a suitable timeframe, for example, allowing the film matrix to disintegrate completely sublingually in about 15 seconds to about 180 seconds, for example, about 30 seconds to about 180 seconds, including about 120 seconds. The present disclosure provides film compositions comprising at least one water-soluble polymer that yield films of sufficient film strength (i.e. self-supporting) and rapid disintegration profiles. In one aspect of the disclosure, the polymer component consists of a single water-soluble polymer. In another aspect, the polymer component consists of two or more water-soluble polymers, including two or more of the same water-soluble polymers having different molecular weights.

When present in one or more droplets of the dexmedetomidine composition which is deposited onto the surface of the polymer substrate, the polymer component may, for example, consist of the water-soluble polymer hydroxypropyl cellulose, although different water-soluble polymers are also contemplated as described hereinafter under the definition “first water-soluble polymer” and “second water soluble polymer”. For example, the polymer component may consist of one, two or three hydroxypropyl celluloses having different molecular weights. The molecular weights of the different hydroxypropyl celluloses may conveniently range from (i) less than about 60,000 daltons (e.g. about 5,000 daltons to about 49,000 daltons) (ii) about 90,000 daltons to about 200,000 daltons and (iii) about 200,000 daltons to about 500,000 daltons. The two or more hydroxypropyl celluloses may be mixed in any suitable ratio to achieve the desired droplet viscosity. The viscosity of the dexmedetomidine composition solution or suspension can be measured using a Brookfield viscometer with a small sample adapter at a temperature of 25° C. and may range from about 5 cps to about 3700 cps. For example, it may range from about 5 cps to about 500 cps, about 6 cps to about 200 cps, about 6 cps to about 100 cps or about 6 cps to about 50 cps. In one aspect of the present disclosure, the viscosity of the dexmedetomidine composition solution or suspension is from about 6 cps to about 20 cps at 25° C. and a shear rate of about 7 (1/s).

When present in a monolithic (i.e. placebo or drug-containing) film, the polymer component may, for example, consist of one water soluble polymer or two different water-soluble polymers. When two different water-soluble polymers are present, one of the water-soluble polymers may include the same polymer but present in the polymer component as a combination of different molecular weights. For example, the polymer component may consist of one, two or three hydroxypropyl celluloses having different molecular weights, although different water-soluble polymers are also contemplated as described hereinafter under the definition “first water-soluble polymer” and “second water soluble polymer” such as polyethylene oxide. The molecular weights of the different hydroxypropyl celluloses may conveniently range from (i) about 5000 daltons to about 49000 daltons (ii) about 90000 daltons to about 200000 daltons and (iii) about 200,000 daltons to about 500,000 daltons (e.g. about 300000 daltons to about 450000 daltons). The two or more hydroxypropyl celluloses (e.g. low and high molecular weight hydroxypropyl celluloses) may be mixed in any suitable ratio to achieve the desired film properties.

When present in a monolithic (i.e. placebo or drug-containing) film or micro-deposited film matrix composition, the polymer component may conveniently consist of one or more water-soluble polymers having a molecular weight less than about 60,000 daltons (e.g. about 5,000 daltons to about 49,000 daltons), and/or from about 90000 daltons to about 200,000 daltons and/or about 200,000 daltons to about 500,000 daltons (e.g. about 300000 daltons to about 450000 daltons). When a structurally different water-soluble polymer is also present, it may conveniently have a higher molecular weight, for example a molecular weight greater than about 500,000 daltons.

In a related aspect, the disclosure provides pharmaceutical film compositions, comprising: (i) dexmedetomidine or a pharmaceutically acceptable salt thereof; (ii) a polymer component consisting of a first water-soluble polymer having a molecular weight less than about 60,000 daltons (e.g. about 5,000 daltons to about 49,000 daltons), and one or more second-water soluble polymers having a molecular weight greater than about 60,000 daltons; and, optionally, (iii) one or more pharmaceutically acceptable carriers.

In another related aspect, the disclosure provides pharmaceutical film compositions consisting essentially of: (i) dexmedetomidine or a pharmaceutically acceptable salt thereof; (ii) a polymer component consisting of a first water-soluble polymer having a molecular weight less than about 60,000 daltons (e.g. about 5,000 daltons to about 49,000 daltons), and one or more second-water soluble polymers having a molecular weight greater than about 60,000 daltons; and, optionally, (iii) one or more pharmaceutically acceptable carriers.

In yet another aspect, the disclosure provides pharmaceutical film compositions consisting of: (i) dexmedetomidine or a pharmaceutically acceptable salt thereof; (ii) a polymer component consisting of a first water-soluble polymer having a molecular weight less than about 60,000 daltons (e.g. about 5,000 daltons to about 49,000 daltons), and one or more second water-soluble polymers having a molecular weight greater than about 60,000 daltons; and, optionally, (iii) one or more pharmaceutically acceptable carriers.

Examples of one or more first water-soluble polymers are selected from the group consisting of hydroxypropyl cellulose (HPC), hydroxyethyl cellulose, hydroxypropyl methylcellulose (HPMC), carboxymethyl cellulose, methyl cellulose and mixtures thereof, including mixtures of the same polymer having different molecular weights.

Examples of one or more second water-soluble polymers are selected from the group consisting of hydroxypropyl cellulose, hydroxypropyl methylcellulose, hydroxyethyl cellulose, carboxy methylcellulose, methylcellulose and mixtures thereof, including mixtures of the same polymer having different molecular weights. Polyethylene oxide (PEO) may also be present herein as a second water-soluble polymer or may be described separately hereinafter in the pharmaceutical film compositions as an example of a pharmaceutically acceptable carrier, or more particularly, as a mucoadhesive agent.

In one embodiment, the weight ratio of said first water-soluble polymer to said second water-soluble polymer(s) (including PEO when present in the film) in the entire film composition is from about 2:1 to about 1:50, for example about 1:1 to about 1:40, including about 1:1, 1:2, 1:3, 1:5, 1:5, 1:6, 1:7, 1:8, 1:9, 1:10, 1:11, 1:12, 1:13, 1:14, 1:15, 1:16, 1:17, 1:18, 1:19, 1:20, 1:21, 1:22, 1:23, 1:24, 1:25, 1:26, 1:27, 1:28, 1:29, 1:30, 1:31, 1:32, 1:33, 1:34, 1:35, 1:36, 1:37, 1:38, 1:39, 1:40.

In a further embodiment, the weight ratio of said first water-soluble polymer to said second water-soluble polymer(s) (including PEO when present in the film) in the entire film composition is from about 1:10 to about 1:30, about 1:15 to about 1:25 or about 1:15 to about 1:20. In certain aspects, a ratio of about 1:15 to about 1:20 provides beneficial functional effects.

Examples of other water-soluble polymers which may be included in the film with the first water-soluble polymer/second water-soluble polymer or replace such polymer(s) include povidone (polyvinylpyrrolidone), copovidone (copolymers of N-vinyl-2-pyrrolidone and vinyl acetate), polyvinyl alcohol, polyethylene glycol, polyacrylic acid, methylmethacrylate copolymer, carboxyvinyl copolymers, polydextrose, pullulan, carboxymethyl cellulose, sodium alginate, chitosan, xanthan gum, tragacanth gum, guar gum, acacia gum, arabic gum, starch, carrageenan, gelatin and mixtures thereof.

The water-soluble polymer component, including water-soluble polymer carriers when present, may conveniently comprise about 40% to about 99.8%, about 50% to about 99.7%, about 60% to about 99.6% of the film composition, based on the weight of the film on a dry weight basis.

In one aspect, the polymer component for the film composition comprises a first water-soluble polymer present in an amount of from about 2% to about 15% on a dry weight basis of the polymer component (e.g. at about 3% to about 8% w/w of the total film weight). This water-soluble polymer may conveniently have a molecular weight from about 5,000 daltons to about 49,000 daltons. Examples of suitable such water-soluble polymers include those selected from the group consisting of hydroxypropyl cellulose, hydroxyethyl cellulose, hydroxypropyl methylcellulose, carboxymethyl cellulose, methyl cellulose, and mixtures thereof.

In a further aspect, low molecular weight hydroxypropyl cellulose may be present in the film at about 3% to about 8% w/w of the total film weight.

In a further aspect, the one or more second water-soluble polymers (including water-soluble polymer carriers such as polyethylene oxide) may, for example, be present in an amount of from about 50 to about 98 weight percent on dry weight basis of the polymer component. The one or more second water-soluble polymers each has a molecular weight greater than 60,000 daltons; for example, from about 90,000 daltons to about 1,500,000 daltons, especially when the polymer is selected from the group consisting of polyethylene oxide, hydroxypropyl cellulose, hydroxypropyl methylcellulose, hydroxyethyl cellulose, carboxy methylcellulose, methylcellulose, and mixtures thereof.

In one aspect, the one or more second water-soluble polymers may together be present in the film at about 25% to about 40% w/w of the total film weight when the one or more second water-soluble polymers each has a molecular weight from about 90,000 daltons to about 200,000 daltons and/or from about 200,000 daltons to about 500,000 daltons, and the polymer is selected from the group consisting of hydroxypropyl cellulose, hydroxypropyl methylcellulose, hydroxyethyl cellulose, carboxy methylcellulose, methylcellulose, and mixtures thereof.

In another aspect, a polyethylene oxide may be present in the film at about 50% to about 60% w/w of the total film weight.

In one embodiment, the polymer component for the film composition consists of a low molecular weight, water-soluble polymer (e.g., having a molecular weight less than about 60,000 daltons) and one or more high molecular weight polymers (e.g., having a molecular weight greater about 60,000, up to about 1,500,000 daltons when a polyethylene oxide is included in the polymer mixture or up to about 500,000 daltons when a polyethylene oxide is not included in the polymer mixture). This polymer combination, especially when the polymers are a combination of hydroxypropyl cellulose and polyethylene oxide, lends certain advantages to the tensile strength and pharmacokinetics of the film composition.

In one aspect, the present disclosure provides a thin film composition comprising, e.g. consisting essentially of:

-   -   (i) a therapeutically effective amount of dexmedetomidine or a         pharmaceutically acceptable salt thereof;     -   (ii) a polymer component consisting of one or more water-soluble         polymers: and     -   (iii) one or more pharmaceutically acceptable carriers.

In one embodiment, the present disclosure provides a thin film composition comprising, e.g. consisting essentially of:

-   -   (i) a therapeutically effective amount of dexmedetomidine or a         pharmaceutically acceptable salt thereof;     -   (ii) a polymer component consisting of: (a) one or more first         water-soluble polymer (e.g. hydroxypropyl cellulose,         hydroxypropyl methylcellulose, hydroxyethyl cellulose, carboxy         methylcellulose, methylcellulose, and mixtures thereof) having a         molecular weight from about 5,000 daltons to about 49,000         daltons, for example, in about 2 to about 15 weight percent on         dry weight basis of the total polymer component; and (b) one or         more second water-soluble polymers (e.g. polyethylene oxide,         hydroxypropyl cellulose, hydroxypropyl methylcellulose,         hydroxyethyl cellulose, carboxy methylcellulose,         methylcellulose, and mixtures thereof) having a molecular weight         greater than 60,000 daltons, such as greater than 100000         daltons, for example in about 50 to about 98 weight percent on         dry weight basis of the total polymer component, and     -   (iii) one or more pharmaceutically acceptable carriers.

The molecular weight of hydroxypropyl cellulose, when present in the film of the present disclosure, may be varied, and may be present as both a low molecular weight, water-soluble polymer and as one or more high molecular weight, water-soluble polymers. In some embodiments, the molecular weight may be less than about 60,000 daltons (e.g. about 5,000 daltons to about 49,000 daltons). In other embodiments the molecular weight may be in the range from about 90,000 daltons to about 200,000 daltons. In yet other embodiments, the molecular weight may be in the range from about 200,000 daltons to about 500,000 daltons.

Hydroxypropyl cellulose, when part of the film composition including polyethylene oxide, may conveniently be present in the range from about 10% to about 90% by weight on a dry weight basis of the polymer component, e.g. about 20% to about 80% by weight on dry weight basis of the polymer component, e.g. about 20% to about 50% by weight on dry weight basis of the polymer component, e.g. about 25% to about 45% by weight on dry weight basis of the polymer component.

The molecular weight of polyethylene oxide, when present in the film of the present disclosure, may also be varied. In some embodiments, a water-soluble, high molecular weight polyethylene oxide may be used, for example, to increase muco-adhesivity of the film. In certain embodiments, the molecular weight may range from about 100,000 daltons to about 1,500,000 daltons, including about 100,000, 200,000, 300,000, 600,000, 900,000 or 1,000,000 daltons. In some embodiments, it may be desirable to use a combination of polyethylene oxide having a molecular weight of about 600,000 daltons to about 900,000 daltons with polyethylene oxide having a molecular weight of about 100,000 daltons to about 300,000 daltons in the polymer component.

Polyethylene oxide, when part of the film composition, may conveniently be present range from about 30% to about 90% by weight on a dry weight basis of the total polymer component, e.g. about 40% to about 85% by weight on a dry weight basis of the polymer component, e.g. about 55% to about 80% by weight on a dry weight basis of the polymer component.

Such film compositions may contain the drug dispersed within the film, or micro-deposited onto a surface of the film. When micro-deposited on the surface of a “placebo” film, the drug may conveniently be added as part of a dexmedetomidine composition as one or more droplets in a liquid carrier, such as a solvent (e.g. an alcohol such as ethanol), optionally together with one or more (e.g. two) water-soluble polymers and/or pharmaceutically acceptable carriers. Suitable water-soluble polymers include (1) a low molecular weight, water-soluble polymer, for example a low molecular weight, water-soluble polymer having a molecular weight of less than about 60,000 daltons (e.g. a molecular weight of about 5,000 daltons to about 49,000 daltons and optionally (2) one or more (e.g. one or two) high molecular weight, water-soluble polymers, for example a high molecular weight, water-soluble polymer having a molecular weight of greater than about 60,000 daltons (e.g. a molecular weight of from about 60,000 daltons to about 150,000 daltons such as hydroxypropyl cellulose (77,000 MW), hydroxypropyl cellulose (80,000 MW), hydroxypropyl cellulose (90,000 MW), or hydroxypropyl cellulose (140,000 MW)) and/or a high molecular weight, water-soluble polymer having a molecular weight of greater than about 60,000 daltons (e.g. a molecular weight of from about 200,000 daltons to about 900,000 daltons such as hydroxypropyl cellulose (340,000 MW), hydroxypropyl cellulose (370,000 MW), polyethylene oxide (200,000 MW) or polyethylene oxide (600,000 MW)). Each water-soluble polymer may independently be selected from the group consisting of hydroxypropyl cellulose, hydroxypropyl methylcellulose, hydroxyethyl cellulose, carboxymethyl cellulose, polyethylene oxide and methyl cellulose, e.g. hydroxypropyl cellulose and/or polyethylene oxide.

In one aspect, the dexmedetomidine composition comprises dexmedetomidine hydrochloride, a low molecular weight polymer which is hydroxypropyl cellulose and one or two high molecular weight polymers which are each hydroxypropyl cellulose in an ethanol solvent.

In one aspect, the dexmedetomidine composition comprises hydroxypropyl cellulose (40,000 MW) and one or both of hydroxypropyl cellulose (140,000 MW) and hydroxypropyl cellulose (370,000 MW).

In one aspect, the dexmedetomidine composition comprises only two hydroxypropyl celluloses, namely hydroxypropyl cellulose (40,000 MW) and hydroxypropyl cellulose (140,000 MW).

In other aspects, the dexmedetomidine composition may be added as one or more droplets in an ethanol-based solution, optionally containing a pH-neutralizing agent such as sodium hydroxide.

The viscosity of deposition solution/suspension may range from about 6 cps to about 3700 cps as measured at 25° C. using a Brookfield viscometer with a small sample adapter. As an example, it may range from about 5 cps to about 500 cps, about 6 cps to about 200 cps, about 6 cps to about 100 cps or about 6 cps to about 50 cps. In one aspect of the present disclosure, the viscosity of the dexmedetomidine composition is from about 6 cps to about 20 cps at 25° C. and a shear rate of about 7 (1/s). The deposition composition may be in any form, including as a solution, emulsion, suspension or dispersion.

Following drying to remove the solvent, the film comprises a film substrate (e.g. a placebo) with the dexmedetomidine composition as previously described but absent solvent deposited (e.g. micro-deposited) on the surface of the film substrate. The dried composition may cover the whole of the film substrate surface or only part of the film substrate surface. In one aspect, the composition appears as one or more discrete drug-containing droplets on the film substrate surface. Alternatively, stenciling may be used to achieve a one or more defined and discrete regions of drug-containing composition on the surface of the film substrate.

In one aspect, the disclosure provides a dry film product comprising a film substrate with one or more discrete drug-containing droplets on the film substrate surface, wherein each such drug-containing droplet comprises dexmedetomidine or a pharmaceutically acceptable salt thereof, and hydroxypropyl cellulose of two molecular weights: hydroxypropyl cellulose (40,000 MW) available as HPC-SSL, and hydroxypropyl cellulose (140,000 MW) marketed under the tradename of Klucel™ Type GF NF, and wherein the film substrate comprises hydroxypropyl cellulose of three molecular weights: hydroxypropyl cellulose (40,000 MW), hydroxypropyl cellulose (140,000 MW), and hydroxypropyl cellulose (370,000 MW) marketed under the tradename of Klucel™ Type GF NF. In one aspect, the film substrate also comprises polyethylene oxide (600,000 MW) available under the name of Sentry Polyox WSR 205 LEO NF.

In one aspect, the film comprises a deposition composition (also referred to herein as a “dexmedetomidine composition”) comprising: (i) dexmedetomidine hydrochloride, present at about 9% to about 50% w/w of the deposition composition, e.g. about 15% to about 25% w/w of the deposition composition; (ii) hydroxypropyl cellulose (40,000 MW), present at about 5% to about 85% w/w of the deposition composition; (iii) hydroxypropyl cellulose (140,000 MW) present at about 5% to 85% w/w of the deposition composition; and (iv) hydroxypropyl cellulose (370,000 MW) present at about 0% to about 65% w/w of the deposition composition. The film also comprises a polymer matrix, wherein the polymer matrix comprises. (i) hydroxypropyl cellulose (40,000 MW) present at about 3% to about 40% w/w of the polymer matrix; (ii) hydroxypropyl cellulose (140,000 MW) present at about 3% to about 40% w/w of the polymer matrix; (iii) hydroxypropyl cellulose (370,000 MW) present at about 0% to about 30% w/w of the polymer matrix, and (iv) polyethylene oxide (600,000 MW) present at about 55% to about 75% w/w of the polymer matrix.

The disclosure also provides a monolithic film formulation for sublingual administration. The film comprises a deposition composition comprising: (i) dexmedetomidine hydrochloride, present at about 1% to about 50% w/w of the total composition; (ii) hydroxypropyl cellulose (40,000 MW), present at about 2% to about 30% w/w of the total composition; (iii) hydroxypropyl cellulose (140,000 MW) present at about 2% to about 30% w/w of the total composition; (iv) hydroxypropyl cellulose (370,000 MW) present at about 10% to about 50% w/w of the total composition, (v) polyethylene oxide (600,000 MW) present at about 40% to about 75% w/w of the total composition and (vi) optionally other pharmaceutically acceptable carriers.

In certain aspects, the films disclosed herein combine several types of hydroxypropyl cellulose (HPC) to provide a film with advantageous properties. For example, the film composition may contain two or three of hydroxypropyl cellulose (40,000 MW), hydroxypropyl cellulose (140,000 MW) and hydroxypropyl cellulose (370,000 MW) in combination. In certain embodiments, polyethylene oxide (600,000 MW) is included with these types of HPC when part of a monolithic film.

In certain film compositions, a low molecular weight hydroxypropyl cellulose (e.g. 40,000 MW) is present at about 3% to about 8% (e.g. about 5%) w/w of the total film weight, a high molecular weight hydroxypropyl cellulose (e.g. 140,000 MW) is present at about 3% to about 8% (e.g. about 5%) w/w of the total film weight, a high molecular weight hydroxypropyl cellulose (e.g. 370,000 MW) is present at about 20% to about 40% w/w of the total film weight, and a polyethylene oxide (e.g. 600,000 MW) is present at about 40% to about 70%, (e.g. about 50% to about 60%) w/w of the total film weight. In one aspect, the two high molecular weight, water-soluble polymers are together present at about 25% to about 40% w/w of the total film weight.

The selection and ratio of water-soluble polymers can be made to effect complete dissolution of the film composition in oral mucosal fluids within seconds to minutes, e.g. in about 0.25 minutes to about 15 minutes, thus ensuring delivery of a therapeutically effective amount of dexmedetomidine or a pharmaceutically acceptable salt thereof via the oral mucosa. For example, the film compositions may reside in the sublingual region of the mouth up to about 15 minutes, up to about 10 minutes, or up to about 5 minutes, including for a period of from about 30 seconds to about 15 minutes, about 1 minute to about 10 minutes, or about 1 minute to about 5 minutes.

The standard basket or paddle apparatus described in any pharmacopoeia can be used for in vitro dissolution testing. The selection of dissolution medium will essentially depend as per the sink conditions and highest dose of drug. The temperature of dissolution medium should be maintained at 37±0.5° C. and rpm at 50 (see Bala et al., in Int J Pharm Investigation, vol. 3(2), pages 67-76).

Films disclosed herein have several functional advantages to promote rapid onset of drug effect. In certain aspects, thin films compositions of the disclosure have a disintegration time (DT) of about 15 seconds to about 180 seconds, about 15 seconds to about 160 seconds, about 25 seconds to about 150 seconds, about 15 seconds to about 140 seconds, about 15 seconds to about 120 seconds, about 40 seconds to about 120 seconds, about 50 seconds to about 120 seconds, for example about 120 seconds, when applied sublingually. A disintegration time in this time-frame provides optimal onset of drug effects.

In other certain aspects, thin film compositions of the invention have mucoadhesion properties that provide practical benefits of localizing the film to the sublingual location and reducing, or preventing, effective removal prior to dissolution. This quality is particularly advantageous in a clinical setting with an agitated subject. Thus, in certain aspects, thin film compositions have a mucoadhesion force (the mucoadhesion strength or shear strength) of about 50 g or above, about 100 g or above, about 200 g or above, about 300 g or above, about 400 g or above, about 500 g or above, about 600 g or above, about 700 g or above, about 800 g or above, about 900 g or above, about 1000 g or above. In certain aspects, the mucoadhesion force is in a range of about 300 g to about 4000 g, about 500 g to about 3000 g, or about 1000 g to about 2000 g.

Burst strength of the film also contributes to drug delivery. Certain thin film compositions of the invention have a burst strength at or above 50 g, 100 g, 200 g, 300 g, 400 g, 500 g, 600 g, 700 g, 800 g, 900 g, 1000 g, 1100 g, 1200 g, 1300 g, 1400 g, 1500 g, 1600 g, 1700 g, 1800 g, 1900 g, 2,000 g, 2,500 g, 3,000 g, 3500 g, 4,000 g, 4,500 g, 5,000 g, 5,500 g, 6,000 g, 6,500 g, 7,000 g, 7,500 g, 8,000 g, 8,500 g, 9,000 g, 9,500 g, 10,000 g or 15,000 g. For example, the burst strength may be in a range of about 200 g to about 15000 g, about 300 g to about 10,000 g, or 400 g to about 5000 g.

Pharmaceutically Acceptable Carriers

The film compositions may further comprise one or more pharmaceutically acceptable carriers that includes, but is not limited to, liquid carriers, flavours, sweeteners, refreshing agents, antioxidants, pH adjusting agents, permeation enhancers, mucoadhesive agents, plasticizers, bulking agents, surfactants/non-ionic solubilizers, stabilizers, anti-foam agents, colors or the like. In certain embodiments, the film compositions are substantially free of acidic buffer or other acidic agents.

Liquid Carriers

According to one aspect, the pharmaceutically acceptable carrier includes a liquid carrier. The liquid carrier comprises one or more solvents useful in the preparation of the polymer matrix (drug containing or placebo) and deposition composition in the film composition. In some embodiments, the solvent may be water. In some embodiments, the solvent may a polar organic solvent including, but not limited to, ethanol, isopropanol, acetone, butanol, benzyl alcohol and mixtures thereof. In some embodiments, the solvent may be a non-polar organic solvent, such as methylene chloride, toluene, ethyl acetate and mixtures thereof. Certain solvents are alcohols, especially ethanol, water and mixtures thereof.

Desirably, the solvent content in the wet polymer matrix is at least about 30% by weight of the total wet weight of the total film composition prior to drying. The subsequent dried film composition will desirably contain less than about 10% by weight of solvent, more desirably less than about 8% by weight of solvent, even more desirably less than about 6% by weight of solvent and most desirably less than about 2% by weight of solvent.

Flavors/Sweeteners/Refreshing Agents

It may be beneficial to add a sweetener, flavoring agent, refreshing agent, taste-masking agent or a combination thereof to the film compositions to improve the film composition taste.

Flavors may be chosen from natural and synthetic flavoring liquids. An illustrative list of such agents includes volatile oils, synthetic flavor oils, flavoring aromatics, oils, liquids, oleoresins or extracts derived from plants, leaves, flowers, fruits, stems and combinations thereof. A non-limiting representative list of examples includes mint oils, cocoa, and citrus oils such as lemon, orange, grape, lime and grapefruit and fruit essences including apple, pear, peach, grape, strawberry, raspberry, cherry, plum, pineapple, apricot or other fruit flavors.

Certain flavors or flavoring agents include natural and artificial flavors. These flavorings may be chosen from synthetic flavor oils and flavoring aromatics, and/or oils, oleo resins and extracts derived from plants, leaves, flowers, fruits and so forth, and combinations thereof. Non-limiting flavor oils include: spearmint oil, cinnamon oil, peppermint oil, clove oil, bay oil, thyme oil, cedar leaf oil, oil of nutmeg, oil of sage, and oil of bitter almonds. Also useful are artificial, natural or synthetic fruit flavors such as vanilla, chocolate, coffee, cocoa and citrus oil, including lemon, orange, grape, lime and grapefruit, and fruit essences including apple, pear, peach, strawberry, raspberry, cherry, plum, pineapple, apricot or the like. These flavorings can be used individually or in combination. Commonly used flavors include mints such as peppermint, artificial vanilla, cinnamon derivatives, and various fruit flavors, whether employed individually or in combination. Flavorings such as aldehydes and esters including cinnamylacetate, cinnamaldehyde, citral, diethylacetal, dihydrocarvyl acetate, eugenyl formate, p-methylanisole, or the like may also be used. Further examples of aldehyde flavorings include, but are not limited to acetaldehyde (apple); benzaldehyde (cherry, almond); cinnamaldehyde (cinnamon); citral, i.e., alpha citral (lemon, lime); neral, i.e. beta citral (lemon, lime); decanal (orange, lemon); ethyl vanillin (vanilla, cream); heliotropine, i.e., piperonal (vanilla, cream); vanillin (vanilla, cream); alpha-amyl cinnamaldehyde (spicy fruity flavors); butyraldehyde (butter, cheese); valeraldehyde (butter, cheese); citronellal (modifies, many types); decanal (citrus fruits); aldehyde C-8 (citrus fruits); aldehyde C-9 (citrus fruits); aldehyde C-12 (citrus fruits); 2-ethyl butyraldehyde (berry fruits); hexenal, i.e. trans-2 (berry fruits); tolyl aldehyde (cherry, almond); veratraldehyde (vanilla); 12,6-dimethyl-5-heptenal, i.e. melonal (melon); 2 dimethyloctanal (greenfruit); and 2-dodecenal (citrus, mandarin); cherry; grape and mixtures thereof. In one embodiment, the flavor is a peppermint oil flavour available as peppermint oil, NF.

The amount of flavoring agent employed is normally a matter of preference, subject to such factors as flavor type, individual flavor, and strength desired. The amount may be varied in order to obtain the result desired in the final product. Such variations are within the capabilities of those skilled in the art without the need for undue experimentation. In general, amounts of about 0.1% to about 30 wt % may be used in the films to supply flavoring.

Suitable sweeteners include both natural and artificial sweeteners. Non-limiting examples of suitable sweeteners include, e.g.: water-soluble sweetening agents such as monosaccharides, disaccharides and polysaccharides such as xylose, ribose, glucose (dextrose), mannose, galactose, fructose (levulose), sucrose (sugar), high fructose corn syrup, maltose, invert sugar (a mixture of fructose and glucose derived from sucrose), partially hydrolyzed starch, corn syrup solids, and dihydrochalcones; water-soluble artificial sweeteners such as the soluble saccharin salts, i.e., sodium or calcium saccharin salts, cyclamate salts, the sodium, ammonium or calcium salt of 3,4-dihydro-6-methyl-1,2,3-oxathiazine-4-one-2,2-dioxide, the potassium salt of 3,4-dihydro-6-methyl-1,2,3-oxathiazine-4-one-2,2-dioxide (acesulfame-K), the free acid form of saccharin or the like; dipeptide based sweeteners, such as L-aspartic acid derived sweeteners, such as L-aspartyl-L-phenylalanine methyl ester (aspartame), L-alpha-aspartyl-N-(2,2,4,4-tetramethyl-3-thietanyl)-D-alaninamide hydrate, methyl esters of L-aspartyl-L-phenylglycerin and L-aspartyl-L-2,5,dihydrophenylglycine, L-aspartyl-2,5-dihydro-L-phenylalanine, L-aspartyl-L-(1-cyclohexyen)-alanine or the like; water-soluble sweeteners derived from naturally occurring water-soluble sweeteners, such as a chlorinated derivatives of ordinary sugar (sucrose), known, for example, as sucralose; and protein based sweeteners such as Thaumatoccous danielli (Thaurnatin I and II), naturally occurring high intensity sweeteners, such as Lo Han Kuo, stevia, steviosides, monellin, and glycyrrhizin. In one embodiment, the sweetener is sucralose.

Refreshing agents, also called cooling agents, are chemicals that trigger the cold sensitive receptors creating a cold sensation. Refreshing agents that can be added to the film compositions include menthol, thymol, camphor and eucalyptol. In one embodiment, the refreshing agent is menthol.

Flavoring agents, sweeteners and refreshing agents can be added in conventional quantities, generally up to a total amount of about 0.01% to about 10% of the weight of the film on a dry weight basis, e.g. from about 0.1% to about 7% of the weight of the film on a dry weight basis, e.g. about 0.1% to about 5% based on the weight of the film on a dry weight basis.

Other taste-masking agents include, for example polymers, oils, or waxes. In one embodiment, dexmedetomidine or a pharmaceutically acceptable salt thereof is coated with a taste-masking agent prior to formulation of the film compositions.

In some embodiments, if a taste-masking agent is used to coat the active ingredient, it may be present in an amount of from about 5% to about 80% by weight of the particle or granule containing the active ingredient. In another embodiment, the taste-masking agent is present in an amount from about 25% to about 35% by weight of the particle or granule containing the active ingredient. The precise loading of the active ingredient in the taste-mask coated particle or granule is a function of many parameters, including the specific form of the active ingredient used (i.e. free base or salt thereof), the coating, and any flavors present in the particle or granule or in the film-forming polymer matrix.

Dexmedetomidine or a pharmaceutically acceptable salt thereof may be taste-masked with the above-described taste-masking agents by a variety of techniques. Useful coating techniques include, but are not limited to, fluidized bed coating, spray congealing coating, agglomeration or granulation coating, entrapment coating, coacervation coating, infusion coating, spin coating, ion exchange coating or the like.

Antioxidants

The film compositions may advantageously employ an antioxidant or oxygen scavenger to prevent or reduce oxidative degradation of dexmedetomidine or a pharmaceutically acceptable salt thereof prior to use. Examples of oxygen scavengers or antioxidants that substantially improve long-term stability of the film composition against oxidative degradation include sulfite salts, such as sodium sulfite, sodium bisulfite, sodium metabisulfite and analogous salts of potassium and calcium.

A suitable amount of the sulfite salt (e.g., sodium sulfite) is up to about 5%, e.g. about 0.001% to about 2% based on the weight of the film composition on a dry weight basis.

pH-Adjusting Agents/pH-Neutralizing Agents

The absorption of dexmedetomidine or a pharmaceutical acceptable salt thereof through the oral mucosa may increase when in an alkaline microenvironment. As an example, this may be achieved when the film compositions are maintained at a pH of above 6, from about 6 to about 9, or about 6.5 to about 8. In some embodiments, the film may include an alkaline substance that increases the pH of the film product. Non-limiting examples of pH-adjusting/pH-neutralizing agents include bicarbonates (e.g., sodium bicarbonate), citrates (e.g., potassium citrate), carbonates (e.g., calcium carbonate), lactates (e.g., sodium lactate), acetates (e.g., calcium acetate), alkaline buffer (e.g. glycine), sodium hydroxide, sodium chloride or the like.

An alkaline buffer, such as glycine, is one example of a pH-neutralizing agent.

The pH-adjusting agents/pH-neutralizing agents can be added into the film composition of in amounts effective to stabilize the pH within the desired pH range. A suitable amount of pH-adjusting/pH-neutralizing agent present in the film composition includes, for example, up to about 10%, e.g. about 1% to about 5% based on the weight of the film composition on a dry weight basis.

Conversely, it has been shown (Table 24 in Example 2 hereinafter; comparative formulation 11) that the addition of an acidic buffer (for example lactate buffer) and/or acidic agent (for example, lactic acid) to the film composition has a detrimental effect on the permeability/diffusion of the active ingredient across the oral mucosa.

Permeation Enhancer Agents

To further promote absorption of dexmedetomidine or a pharmaceutical acceptable salt thereof through the oral mucosa and reduce the amount of dexmedetomidine that is introduced into the gastrointestinal tract, it may be advantageous to add a permeation enhancer agent (i.e. a penetration enhancer) to a film composition. Certain effective penetration enhancers that promote absorption of dexmedetomidine or a pharmaceutically acceptable salt thereof across the oral mucosa include alcohols. An alcohol penetration enhancer, such as butanol, can conveniently be added to the film composition in an amount of up to about 10%, e.g. about 0.1% to about 5%, e.g. about 1% to about 3% based on the weight of the film composition on a dry weight basis.

Mucoadhesive Agents

In order to promote adhesion of the film composition to the oral mucosa, it may be advantageous to add a mucoadhesive agent to a film formulation. Examples of mucoadhesive agents that can be added to the film composition include, but are not limited to, sodium alginate, sodium carboxymethyl cellulose, guar gum, polyethylene oxide, hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxypropylmethyl cellulose, karya gum, methylcellulose, retene, tragacanth and the like. One mucoadhesive agent is polyethylene oxide, which may conveniently be added to the film composition in an amount of from about 20% to about 90%, e.g. about 40% to about 70% based on the total weight of the film composition on a dry weight basis. It will be understood that water-soluble mucoadhesive agents that are polymers, such as polyethylene oxide, are also within the definition of a second water-soluble polymer as previously described under the term “polymer component”.

Plasticizers

Plasticizers can be advantageously employed in the film compositions, as needed, to suitably modify the flexibility of the film to facilitate processing and allow the film to easily conform to the shape of the part of the oral cavity to which the film is applied. Plasticizers that can be effectively employed herein include polyethylene glycol, propylene glycol, tributyl citrate, triethyl citrate and glycerol. Depending on the selected film-forming polymer(s) and other components of the film formulation, a suitable amount of plasticizer included in the film composition may typically be up to about 10%, e.g. about 0.1% to about 5%, e.g. about 0.5% to about 5% based on the weight of the film on a dry weight basis. For certain applications, higher molecular weight polyethylene glycols may be utilized, including polyethylene oxide.

Bulking Agents

Bulking agents (i.e. fillers) may be added as desired to increase the size of the finished film product to facilitate processing and manufacturing, or to modify properties (e.g., increase or decrease residence time or increase stiffness) of the film formulation. Suitable fillers that can be added to a film composition of include starch, calcium salts, such as calcium carbonate, and sugars, such as lactose, glucose, sucrose, mannose, sorbitol, mannitol, galactitol, sucralose, trehalose and combinations thereof. The amount of filler that can conveniently be added to the film formulation is typically up to about 25%, e.g. about 0.5% to about 20%, e.g. about 1% to about 15%, e.g. about 2% to about 10%, based on the weight of the film composition on a dry weight basis.

Surfactants/Non-Ionic Solubilizers

The film typically incorporates at least one surfactant/non-ionic solubilizer including, for example, but not limited to, a poloxamer, polyoxyl hydrogenated castor oil, glyceryl polyethylene glycol oxystearates, fatty acid glyceryl polyglyceryl esters, polyglyceryl esters, and combinations thereof. The amount of surfactant(s) that can be added to the film composition is typically up to about 5%, e.g. about 0.5% to about 3%, e.g. about 1% to about 3% based on the weight of the film composition on a dry weight basis.

Anti-Foaming Components

Anti-foaming and/or de-foaming components may also be used in a film composition. These components aid in the removal of air, such as entrapped air, from the film compositions. Such entrapped air may lead to non-uniform films. Simethicone is an example of a useful anti-foaming and/or de-foaming agent, although other anti-foaming and/or de-foaming agents may suitable be used. An anti-foaming and/or de-foaming agent such as simethicone may be added to the film composition in an amount from about 0.01% to about 5.0%, more desirably from about 0.05% to about 2.5%, and most desirably from about 0.1% to about 1.0% based on the weight of the film composition on a dry weight basis.

Colorants

Color additives that may be included in a film composition include food, drug and cosmetic colors (FD&C), drug and cosmetic colors (D&C), or external drug and cosmetic colors (Ext. D&C). These colors are dyes, their corresponding lakes, and certain natural and derived colorants. Lakes are dyes absorbed on aluminium hydroxide. Other examples of color additives include known azo dyes, organic or inorganic pigments, or coloring agents of natural origin. Certain examples of color additives are inorganic pigments, such as oxides of iron or titanium, added in concentrations ranging from about 0.001% to about 10%, e.g. about 0.01% to about 3%, based on the weight of the film composition on a dry weigh basis. In one embodiment, the color used for the dexmedetomidine composition (i.e. the deposit composition) is different from the color used for the film substrate (e.g. the placebo film).

One color of the monolithic film and the film substrate of the micro-deposited film is emerald green, and available as Fast Emerald Green Shade (06507). One color of the dexmedetomidine composition (i.e. the deposit composition) is a different color from the color of the film substrate, e.g. blue (available as FD&C Blue No. 1).

Manufacture of Film Compositions:

The film compositions may be prepared as disclosed herein.

In general, one of the methods of preparing monolithic thin film formulations involves casting the liquid formulation as a continuous web in the form of wide and long rolls on a continuous substrate (e.g. paper or polyester liners which may or may not have release coatings) to form what is sometimes referred to as a master roll. The manufacturing process includes drying the liquid formulation to remove solvents (aqueous and/or non-aqueous) to yield the thin film on the substrate. The master rolls thus formed are then converted into smaller unit doses through roll slitting and individual unit dose die-cutting. The unit doses are then transferred from the manufacturing substrate for primary product packaging.

As an example, solvent casting may conveniently be used to prepare the polymer film matrix. If the active ingredient is part of the polymer film matrix, the active ingredient, polymer(s) and other ingredients (e.g. carriers) are mixed in a solvent prior to preparing the polymer film matrix. Generally a low shear agitator can be used for bulk mixing and efficient heat transfer while an inline homogenizer can be used for high shear dispersion. The mixer is capable of applying vacuum during processing to eliminate entrapment of air bubbles in the mixture, which manifest as film defects during the subsequent coating process. The ingredients can be added to the mixer in any order and therefore the process is not limited by the order of addition of each ingredient.

During the coating process the mixture is transported to the coating head via a controlled metering pump to assure consistent delivery of the fluid. Coating may utilize a knife-over-roll coating head, reverse roll coating head, or a slot-die coating head based on which technique is most appropriate for the fluid rheology and the substrate to be coated. Those skilled in the art of coating processes appreciate the various techniques and be able to determine the appropriate coating technique based upon the required film parameters. During the coating process, the fluid is deposited onto a release liner and then conveyed through a “drying tunnel.”

During the drying process, forced hot air is applied to the top side of the coating, to the bottom side of the coating, or to any combination of top and bottom sides of the coating to achieve a film that contains less than or equal to the specified residual solvent level. Drying ovens can be of any length but are typically between 2-10 meters in length. Multiple drying ovens can be sequentially staged so that the wet coating passes through multiple drying ovens, each of which can be set to different drying temperatures of air pressures. During the drying process the coater may run at line speeds between 0.25-5 meters/minute and the line speed is dictated by the efficiency of the drying process and the specified residual solvent level required for a particular film product. After the film coating has exited the oven, it is wound up onto a core.

In addition to solvent casting, other examples for preparing a polymer film matrix include a semi-solid casting method, solid dispersion extrusion method, rolling method, hot melt extrusion method and the combination thereof.

“Casting” refers to the method in which polymers and additional ingredients (including the active agent) may be dissolved or slurried in a suitable solvent, any entrapped air is removed, the resulting mixture cast onto a suitable substrate, and dried to remove solvent to form a film (e.g. a thin film). The film is then cut into any desired shape and size.

In one embodiment of the solvent casting method, a solution comprising one or more polymers (and optionally one or more suitable pharmaceutically acceptable carriers) is mixed with a solution of the active ingredient (and any other pharmaceutically acceptable carriers), any entrapped air is removed (e.g. under vacuum), and the resulting mixture cast onto a suitable substrate and dried to remove solvent to form a film (e.g. a thin film).

In another embodiment of the solvent casting method, all the film composition ingredients are mixed together in a solvent to produce a solution or slurry, any entrapped air is removed (e.g. under vacuum) and the resulting mixture cast onto a suitable substrate and dried to remove solvent to form a film (e.g. a thin film).

In a further embodiment, when the active ingredient is dispersed within the film polymer matrix (as opposed to deposition on the surface of the “placebo” polymer matrix), the active ingredient may be substantially uniformly distributed throughout the polymer matrix.

If, alternatively, the active ingredient is present on the surface of polymer film matrix, a “placebo” polymer film matrix (i.e. containing no drug) is initially prepared as a continuous polymer film matrix, and the active ingredient as part of a suitable composition (the dexmedetomidine composition) is directly deposited onto the surface of the dried continuous polymer film matrix. In another embodiment, a “placebo” polymer matrix is formed as a continuous web that is cut into individual units prior to depositing the dexmedetomidine composition to the surface of “placebo” polymer matrix. One advantage of micro-deposited matrix compositions and the method used to prepare them is that the final unit doses are less susceptible to variation in the amount of dexmedetomidine present than can occur during the preparation of conventional drug-containing monolithic films. Micro-deposition helps to ensure that a relatively more precise and consistent volume of formulation and dexmedetomidine is deposited. Another advantage of micro-deposited matrix compositions and the method used to prepare them is that different doses can be produced from the same roll of film substrate. The dose either depends on the number of droplets that are applied to a certain area of the substrate or the way the film is cut after application of the droplets is a consistent pattern. Conversely, in drug-containing monolithic films, the process only allows for the preparation of units containing the same dose of drug.

In a detailed embodiment of the solvent casting method, a solution comprising one or more polymers (and optionally any suitable pharmaceutically acceptable carriers) is prepared, any entrapped is air removed (e.g. under vacuum), and the resulting mixture cast onto a suitable substrate and dried to remove solvent to form a film (e.g. a thin film). Separately, the active ingredient and any other necessary ingredients, e.g. pharmaceutically acceptable carrier(s) and/or polymer component, are dissolved/dispersed in a liquid carrier to form an active agent-containing solution or slurry. The resultant active agent solution or slurry is then deposited onto the previously prepared film (i.e. “placebo” polymer matrix) surface.

According to certain exemplary embodiments, the method of depositing the active agent solution or slurry onto a “placebo” polymer matrix is accomplished by direct dispensing as described in more detail below. In certain alternate exemplary embodiments, direct dispensing may also be performed with a needle or array of needles.

Broadly methods of depositing an active ingredient onto a “placebo” polymer matrix, in accordance with exemplary embodiments, employ dispensing a small volume of the active ingredient, typically between 1 μL to about 5000 μL, 1 μL to about 100 μL, 1 μL to about 500 μL, 250 μL to about 750 μL, alternatively between 500 μL to about 1000 μL, alternatively between 1 μL to about 1000 μL, alternatively between 500 μL to about 1500 μL, alternatively between 1000 μL to about 2000 μL alternatively between 1500 μL to about 2500 μL, alternatively between 2000 μL to about 3000 μL directly, alternatively between 2500 μL to about 3500 μL, alternatively between 3000 μL to about 4000 μL, alternatively between 3500 μL to about 4500 μL, alternatively between 4000 μL to about 5000 μL directly on to a surface of the “placebo” polymer matrix. In some embodiments, the entire volume is dispensed in a single step, although for total volumes higher than 10 microliters, it may be desirable to serially dispense multiple iterations of smaller volumes adjacent and/or overlying one another (e.g. in a linear fashion) to form the micro-deposited matrix composition.

Dexmedetomidine may be dispensed from a dispenser head by a force that moves the liquid from reservoir in, or connected to, the dispenser head to the surface of the “placebo” polymer matrix. This may be achieved by positive displacement pumping through the dispensing head positioned over the surface of “placebo” polymer matrix. The “placebo” polymer matrix may be a continuous polymer film sheet or single unit polymer. The dispenser head is typically, not necessarily, a needle like tip of the type used in the aforementioned micro-deposition processes.

The geometry of dexmedetomidine deposition formed by direct dispensing in accordance with exemplary embodiments may be of any type. In some embodiments, the active formulation may be dispensed in a circular shape, as will occur by expressing the formulation from a cylindrical tip in which the surface energy of the substrate surface is uniform. In accordance with other embodiments, square, rectangle, or even more complex polygon shapes may be employed. This may be achieved by providing a dispenser head in which dexmedetomidine solution or slurry exits the head and is pinned between the head and target surface to establish the desired shape. Thus, if the geometry of the dispenser's head surface closest to “placebo” polymer matrix is rectangular, then rectangular deposit is generated.

Alternatively, a single unit dose may be formed by repeated smaller dispensing cycles from one or more dispensing units. Each dispenser head may be attached to a robotic arm that controls where dexmedetomidine liquid formulation is deposited on the “placebo” polymer matrix. Alternatively, the platform on which “placebo” polymer matrix is mounted may be motorized to move the “placebo” polymer matrix as the deposition liquid formulation is being dispensed from a fixed dispenser head. These configurations afford the ability to vary the size and shape of the dose as needed.

It will be appreciated that other ways may also be employed to dispense dexmedetomidine liquid formulation of various geometries. For example, the surface energy of the “placebo” polymer matrix may be modified to result in better wetting by the dexmedetomidine liquid formulation. In one embodiment, a corona or plasma treatment using a mask with openings of the geometry to be obtained provides a well-defined region on the surface of“placebo” polymer matrix of increased surface energy that promotes fluid migration to cover the treated area. In another embodiment, the surface energy of the formulation being dispensed may be modified or tailored to achieve a desired flow characteristic during and after dispensing. In yet another embodiment, a dam or frame in the desired geometry is provided on the “placebo” polymer matrix, followed by dispensing the liquid dexmedetomidine from the dispensing head into the defined area to generate a deposit with a specific geometry and uniformity. The dexmedetomidine composition is deposited on the surface of the “placebo” polymer matrix within the framed area in sufficient volume to fill the framed area at the required depth. This stenciling technique allows the “placebo” polymer matrix to provide a peripheral seal around the active layer when the film is applied to mucosa. This can prevent leakage of the active ingredient from the periphery of the active layer into the oral cavity and further helps to ensure that all of the drug is delivered via the desired mucosal pathway.

It will be appreciated that the fluid characteristics of the dexmedetomidine liquid formulation (the dexmedetomidine composition) being dispensed may impact the ability to consistently obtain uniform film dispensing. For dispensing by a positive displacement pump, the fluid viscosity of the dexmedetomidine formulation is, for example, in the range of 1 to 5000 cps as measured at 25° C. using a Brookfield viscometer using a small sample adapter. However, the particular viscosity of the dexmedetomidine formulation within this range may vary depending upon a variety of factors depending on the characteristics of the deposition to be created, including how the liquid formulation is desired to behave after it is dispensed onto the substrate, which itself may be a function of how a particular film geometry is to be obtained. For example, pinning the liquid film formulation so that it does not spread beyond the intended area may be influenced by the fluid's viscosity, as well as its surface tension and the “placebo” polymer matrix surface energy.

Typically, the solvent casting method produces a film having a thickness of from about 20 micrometers to about 1200 micrometers, e.g. about 50 micrometers to about 1000 micrometers, e.g. about 70 micrometers to about 200 micrometers. The dry film can be cut in appropriate sizes, typically an area of from about 1 square centimeter to about 15 square centimeters (e.g. about 1 cm² to about 3 cm²), to provide an appropriate dose of dexmedetomidine or a pharmaceutically acceptable salt thereof, e.g. in the size of length of from about 5 mm to about 15 mm (e.g. 8.8 mm±0.5 mm) and width of from about 10 mm to about 30 mm (e.g. 22 mm±1.5 mm).

In one embodiment, the film composition is prepared by a deposition method that results in a “placebo” film having, on the surface thereof, a substantially non-uniform distribution of dexmedetomidine or a pharmaceutically acceptable salt thereof. In certain aspects, where the deposition process requires or benefits from drying following deposition, drying ovens and/or forced hot air may be used. Drying temperature may vary from about 40° C. to about 80° C. Drying temperature is adjusted in such a manner that moisture content of film is about ≤5%. Drying time may vary from about 5 minutes to about 180 minutes, e.g. about 5 minutes to about 60 minutes. In some embodiments, drying time may be about at least 30 minutes. Optionally, gentle air flow and low temperatures (˜40-50° C.) in the drying ovens may be used. The fluid rheology of a particular deposition formulation will dictate the particular drying parameters required. In some embodiments, drying conditions may include heating at 70° C. for 5-10 minutes. Each unit contains at least one spot of micro-deposition composition. The viscosity of the micro-deposition solution/suspension (the dexmedetomidine composition) may range from about 6 cps to about 3700 cps, when measured at 25° C. using a Brookfield viscometer with a small sample adapter. For example, the viscosity is from about 6 cps to about 500 cps, about 6 cps to about 200 cps, about 6 cps to about 100 cps, about 6 cps to about 50 cps, or about 6 cps to about 20 cps at 25° C. and a shear rate of about 7 (1/s).

If deposition does not require a drying step, then the process can continue after initial substrate drying and during slitting of master rolls. Since the film is wide web, it is possible that multiple lanes of deposition can occur at the same time. It is also contemplated that the deposition process can be accomplished using a single lane.

Additionally, if the deposition does not require drying following deposition, the packaging machine can be equipped with a slitting station to control the width of the film being processed. This is a standalone station that can function in-line during the processing of finished units. Formulation can be deposited onto the surface of a placebo slit roll by applying a single deposition apparatus in-line at the slitting station. An air-knife and IR heater placed in-line to gently blow air over the film after deposition would provide slight drying of the deposition, despite the application not requiring drying. This reduces the amount of solvent remaining in the deposition if necessary. Following deposition, the film is die-cut and packaged as a unit dose.

In other embodiments, any suitable drying process may be applied such as thermal drying process. Other methods include gas forced air drying in which hot air is blown down on the deposit at high velocity to minimize the boundary layer and facilitate mass transfer, drying in a box oven and IR drying, all by the way of example.

The packed films must be stored at a controlled temperature, e.g. from about 15-30° C.

Another benefit of direct dispensing individual unit doses is an ability to vacuum dry the dispensed dexmedetomidine composition onto the polymer matrix film. The use of vacuum drying provides faster drying times at lower temperatures that, in turn, affords improved productivity, low energy consumption (less heat) and improved film and drug stability as a result of the lower temperatures. Vacuum drying may also yield a better content uniformity and patient dosing by reduced potential for entrapped air or bubble defects. Improved productivity may be achieved by drying more quickly at lower pressures as well as affording integration of other product conversion steps as part of an overall, in-line process sequence.

One example of a deposition method comprises the following steps:

-   -   (i) preparing a first composition comprising a polymer component         and one or more pharmaceutically acceptable carriers, including         a liquid carrier, and optionally other pharmaceutically         acceptable carriers;     -   (ii) solvent casting the product of step (i) to produce a         polymer matrix (“placebo” polymer matrix);     -   (iii) conveying said polymer matrix through a drying apparatus         to form a dried polymer matrix;     -   (iv) preparing a second composition comprising dexmedetomidine         or a pharmaceutically acceptable salt thereof, one or more         pharmaceutically acceptable carriers, including a liquid         carrier, and optionally other pharmaceutically acceptable         carrier(s) and a polymer component;     -   (v) depositing the dexmedetomidine composition onto the dried         polymer matrix of step (iii) as one or more droplets; and     -   (vi) drying, including allowing to dry without using a drying         method, to remove at least a portion of the liquid carrier from         the product of step (v) to produce the final product.

Additional ingredients can also be applied to the dried film by, for example, printing, spraying, dusting, or vapor adsorption processes, among others.

The film product can be processed into unit doses by any suitable technique, including, for example, die-cutting or cutting across the width of a singular narrow roll to prepare unit doses of any desired geometric size or shape. The unit doses may then conveniently be packaged with various suitable materials known in the art to prevent degradation and protect the active ingredient from adulteration.

Desirably, a series of such unit doses are packaged together in accordance with the prescribed regimen or treatment, e.g., a 10-90 day supply, depending on the particular therapy. Individual films may also comprise a backing material, which can be peeled off prior to use.

The present disclosure also provides film compositions of dexmedetomidine or a pharmaceutically acceptable thereof, wherein the film has the thickness about 0.02 millimeters (20 micrometers) to about 0.2 millimeters (200 micrometers), resulting in weight in the range of about 0.5 milligrams to about 200 milligrams. Thus, in some aspects, the film compositions comprise a polymer matrix monolayer having a limited thickness allowing them to rapidly disintegrate in the oral environment and release dexmedetomidine or a pharmaceutically acceptable salt thereof without undue discomfort to the oral mucosa. Such a composition may be a “placebo” layer with drug deposited on a surface or may contain the active ingredient in the polymer matrix itself.

In a further embodiment, we provide the co-administration of a film of this disclosure together with a long-acting dexmedetomidine formulation. Examples of long-acting dexmedetomidine formulations include transdermal patches and depot products such as depot injections (e.g. IV or IM) or implantable devices. Examples of transdermal patches include patches disclosed in published U.S. patent/patent applications nos. U.S. 2015/0098980, U.S. 2015/0098997, US 2015/0098983, U.S. 2015/0098982, U.S. 2015/0098981, U.S. 2018/0117012, U.S. 20140328898, US 20130072532, U.S. Pat. Nos. 5,817,332, 5,217,718, 5,820,875, and 9,974,754 and related patents/patent applications.

A specific embodiment provides a method of treating agitation in a subject comprising administering to a subject a film of the present disclosure and concurrently or subsequently administering a long-acting transdermal patch formulation of dexmedetomidine, optionally followed by the further administration of a film of the present disclosure.

A further specific embodiment provides a method of treating agitation in a subject comprising administering to a subject a film of the present disclosure and concurrently or subsequently administering a long-acting depot injectable formulation of dexmedetomidine, optionally followed by administration of a film of the present disclosure.

Therapeutic Use of Film Compositions:

The film compositions disclosed herein may be used for the treatment of various disorders/conditions including:

-   -   Agitation associated with neurodegenerative conditions selected         from the group consisting of: Alzheimer disease, frontotemporal         dementia (FTD), dementia, dementia with Lewy bodies (DLB),         post-traumatic stress disorder, Parkinson's disease, vascular         dementia, vascular cognitive impairment, Huntington's disease,         multiple sclerosis, Creutzfeldt-Jakob disease, multiple system         atrophy, and progressive supranuclear palsy; senile dementia of         the Alzheimer type (SDAT)     -   Agitation associated with neuropsychiatric conditions selected         from the group consisting of: schizophrenia, bipolar disorder,         bipolar mania, delirium, and depression, including dementia or         mood disorders in subjects with major depression (e.g.         stress-related major depression);     -   Agitation associated with other conditions such as OPD/IPD         procedures (e.g. MRI, CT or CAT scan, lumbar puncture, bone         marrow aspiration/biopsy, tooth extraction and other dental         procedures);     -   Agitation associated with alcohol, opioid use disorder, opioid         withdrawal and substance abuse withdrawal;     -   Delirium;     -   Traumatic brain injury (TBI), including TBI subjects with         alcohol or substance use disorder (ASUD);     -   Post-Traumatic Stress Disorder (PTSD), including PTSD subjects         with alcohol or substance use disorder (ASUD);     -   Tardive dyskinesia;

The film compositions disclosed herein find particular use in the treatment of acute agitation associated with the disorders/conditions described above.

The film compositions disclosed herein also find particular use in the treatment of hyper-arousal associated with acute agitation in patients with schizophrenia, bipolar disorder, and dementia.

The film compositions disclosed herein also find particular use in the treatment of acute agitation without causing significant sedation.

The film compositions disclosed herein also find particular use in the treatment of chronic agitation without causing significant sedation.

The film compositions disclosed herein may also be used as adjunct therapeutics to exposure therapy for the treatment of post-traumatic stress disorder (PTSD).

The film compositions disclosed herein may also be used for the treatment of PTSD with or without standard treatment of PTSD.

The film compositions disclosed herein also find particular use in the treatment of post-traumatic stress disorder (PTSD) associated with alcohol or substance use disorder (ASUD).

The film compositions disclosed herein may also be used as an adjunct therapeutic before, during or after Exposure Therapy (ET) for patients undergoing ASUD treatment co-morbid with PTSD or traumatic brain injury.

In one aspect, the film compositions disclosed herein may be used for the treatment of patients with PTSD that suffer from alcohol and/or substance abuse, for example in treating PTSD patients who are seeking to overcome alcohol and/or substance dependence and are susceptible to alcohol and/or substance abuse withdrawal symptoms.

In another aspect, the film compositions disclosed herein may be used for the treatment of patients with TBI that suffer from alcohol and/or substance abuse, for example in treating TBI patients who are seeking to overcome alcohol and/or substance dependence and are susceptible to alcohol and/or substance abuse withdrawal symptoms.

The patients, also referred to as subjects, are typically human subjects. In aspects, the human is at least 55, at least 60, at least 65 or at least 75. The methods and formulations disclosed herein thus have use, for example, in humans aged 55 to 75.

In one aspect, the present disclosure provides methods for treating or ameliorating agitation associated with neurodegenerative conditions by administering to such patients in need of treatment a dexmedetomidine film formulation as described herein.

In another aspect, the present disclosure provides methods for treating or ameliorating agitation associated with neuropsychiatric conditions by administering to such patients in need of treatment a dexmedetomidine film formulation as described herein.

In a further aspect, the present disclosure provides methods for treating or ameliorating agitation associated with other conditions such as OPD/IPD procedures (e.g. MRI, CT or CAT scan, lumbar puncture, bone marrow aspiration/biopsy, tooth extraction or other dental procedures) by administering to such patients in need of treatment a dexmedetomidine film composition as described herein.

In a yet further aspect, the present disclosure provides methods for treating or ameliorating agitation associated with alcohol and substance abuse withdrawal by administering to such patients in need of treatment a dexmedetomidine film formulation as described herein.

The dosage forms disclosed herein dissolve or disintegrate rapidly in the patient's mouth without chewing or the need for water. Because of their ease of administration, such compositions are particularly useful for the specific needs of patients with compromised motor skills.

Typical per unit dose of dexmedetomidine or a pharmaceutically acceptable salt thereof include from about 0.5 micrograms to about 200 micrograms, about 0.5 micrograms to about 150 micrograms, from about 1 microgram to about 100 micrograms, from about 3 micrograms to about 90 micrograms, from about 3 micrograms to about 80 micrograms, from about 3 micrograms to 70 micrograms, from about 3 micrograms to about 60 micrograms, from about 3 micrograms to 50 micrograms, from about 3 micrograms to about 40 micrograms, from about 3 micrograms to about 35 micrograms, from about 5 micrograms to about 35 micrograms, about 10 micrograms to about 50 micrograms, about 10 micrograms to about 40 micrograms, about 10 micrograms to about 35 micrograms, about 15 micrograms to about 35 micrograms or about 15 micrograms to 35 micrograms of dexmedetomidine or a pharmaceutically acceptable salt thereof. In certain embodiments, the per unit dose is about 10 micrograms, about 15 micrograms, about 20 micrograms, about 25 micrograms, about 30 micrograms, about 35 micrograms, about 40 micrograms, about 45 micrograms, about 50 micrograms, about 55 micrograms, about 60 micrograms, about 65 micrograms, about 70 micrograms, about 75 micrograms, about 80 micrograms, about 85 micrograms, about 90 micrograms, about 95 micrograms, about 100 micrograms, about 110 micrograms, about 120 micrograms, about 130 micrograms, about 140 micrograms or about 150 micrograms. Each unit may be administered to the subject multiple times per day, including twice, three times, four times, five times or six times per day.

The exemplary dosage of dexmedetomidine or a pharmaceutically acceptable salt thereof to be administered to a particular patient, will depend on the type and extent of the condition, the overall health status of the particular patient, the particular form of dexmedetomidine or a pharmaceutically acceptable salt thereof being administered, and the particular film formulation used to treat the patient.

Combination Therapy

In one embodiment, the present disclosure provides a film as disclosed herein, wherein the film comprises dexmedetomidine or a pharmaceutically acceptable salt thereof together with one or more additional therapeutic agents. Such combination therapy may be particularly useful in the treatment of agitation in conditions caused or exacerbated by alcohol or other substance abuse, including post-traumatic stress disorder and traumatic brain injury (TBI).

Examples of suitable additional therapeutic agents include opioid antagonists (e.g. naltrexone or naloxone), opioid partial agonists (e.g. buprenorphine, butorphanol, pentazocine or tramadol), and anti-depressants such as serotonin-norepinephrine reuptake inhibitors (e.g. amitriptyline, atomoxetine, desipramine, duloxetine, maprotiline, mefazodone, milnacipran, nefazodone, protriptyline, trimipramine, reboxetine, venlafaxine, or viloxazine), or selective serotonin reuptake inhibitors (e.g. citalopram, fluoxetine, paroxetine, sertraline, fluvoxamine, citalopram, or escitalopram). For example, a film as disclosed herein comprising dexmedetomidine or a pharmaceutically acceptable salt thereof can improve the response to currently used treatment in subjects with PTSD, such as serotonin-norepinephrine reuptake inhibitors and selective serotonin reuptake inhibitors, for example by achieving a more rapid response or an augmented response prior to the initial use and after the discontinuation of the serotonin-norepinephrine reuptake inhibitor or selective serotonin reuptake inhibitor. Dexmedetomidine or a pharmaceutically acceptable salt thereof may also be used in combination with a NMDA receptor antagonist such as ketamine to treat major depression, for example agitation in subjects with dementia or mood disorders associated with stress-related major depression.

In one embodiment, the present disclosure provides a film as disclosed herein, wherein the film comprises dexmedetomidine or a pharmaceutically acceptable salt thereof together with an opioid antagonist or a pharmaceutically acceptable salt thereof.

In a further embodiment, the present disclosure provides a film as disclosed herein, wherein the film comprises dexmedetomidine or a pharmaceutically acceptable salt thereof together with an effective amount of an opioid antagonist or a pharmaceutically acceptable salt thereof for the treatment of agitation, without causing excessive sedation.

In a further embodiment, the present disclosure provides a film as disclosed herein, wherein the film comprises dexmedetomidine or a pharmaceutically acceptable salt thereof together with an effective amount of an opioid antagonist or a pharmaceutically acceptable salt thereof for the treatment of agitation associated with opioid or substance withdrawal.

In a specific embodiment, the present disclosure provides a film as disclosed herein, wherein the film comprises dexmedetomidine or a pharmaceutically acceptable salt thereof together with naltrexone or a pharmaceutically acceptable salt thereof.

In another embodiment, the present disclosure provides a film as disclosed herein, wherein the film comprises dexmedetomidine or a pharmaceutically acceptable salt thereof together with an opioid partial agonist or a pharmaceutically acceptable salt thereof.

In a further embodiment, the present disclosure provides a film as disclosed herein, wherein the film comprises dexmedetomidine or a pharmaceutically acceptable salt thereof together with an effective amount of a partial agonist or a pharmaceutically acceptable salt thereof for the treatment of agitation without causing excessive sedation.

In further embodiment, the present disclosure provides a film as disclosed herein, wherein the film comprises dexmedetomidine or a pharmaceutically acceptable salt thereof together with an effective amount of a partial agonist or a pharmaceutically acceptable salt thereof for the treatment of agitation associated with opioid withdrawal.

In specific embodiment, the present disclosure provides a film as disclosed herein, wherein the film comprises dexmedetomidine or a pharmaceutically acceptable salt thereof together with buprenorphine or a pharmaceutically acceptable salt thereof

An effective amount of dexmedetomidine or a pharmaceutically acceptable salt thereof and opioid antagonist or partial agonist may be included in the film of the present disclosure, so as to provide the desired effect.

In one embodiment, the film comprises about 5 micrograms to 150 micrograms of dexmedetomidine or a pharmaceutically acceptable salt thereof and about 2 mg to about 16 mg of the partial agonist per unit. More desirably, the film comprises about 5 micrograms to 150 micrograms of dexmedetomidine or a pharmaceutically acceptable salt thereof and about 4 mg to about 12 mg of partial agonist per unit.

In another embodiment, the film comprises about 5 micrograms to 150 micrograms of dexmedetomidine or a pharmaceutically acceptable salt thereof and about 0.5 mg to about 5 mg of the opioid antagonist per unit. More desirably, the film comprises about 5 micrograms to 150 micrograms of dexmedetomidine or a pharmaceutically acceptable salt thereof and about 1 mg to about 3 mg of opioid antagonist per unit.

In one specific embodiment, the film comprises about 10 micrograms to 60 micrograms of dexmedetomidine or a pharmaceutically acceptable salt thereof and about 0.5 mg naltreone, or about 10 micrograms to 60 micrograms of dexmedetomidine or a pharmaceutically acceptable salt thereof and about 1 mg naltrexone, or about 10 micrograms to 60 micrograms of dexmedetomidine or a pharmaceutically acceptable salt thereof and about 2 mg naltrexone, or about 10 micrograms to 60 micrograms of dexmedetomidine or a pharmaceutically acceptable salt thereof and about 3 mg naltrexone, or about 10 micrograms to 60 micrograms of dexmedetomidine or a pharmaceutically acceptable salt thereof and about 4 mg naltrexone, or any similar amounts.

In another specific embodiment, the film comprises about 10 micrograms to 60 micrograms of dexmedetomidine or a pharmaceutically acceptable salt thereof and about 2 mg buprenorphine, or about 10 micrograms to 60 micrograms of dexmedetomidine or a pharmaceutically acceptable salt thereof and about 4 mg buprenorphine, or about 10 micrograms to 60 micrograms of dexmedetomidine or a pharmaceutically acceptable salt thereof and about 6 mg buprenorphine, or about 10 micrograms to 60 micrograms of dexmedetomidine or a pharmaceutically acceptable salt thereof and about 8 mg buprenorphine, or about 10 micrograms to 60 micrograms of dexmedetomidine or a pharmaceutically acceptable salt thereof and about 10 mg buprenorphine, or about 10 micrograms to 60 micrograms of dexmedetomidine or a pharmaceutically acceptable salt thereof and about 12 mg buprenorphine, or about 10 micrograms to 60 micrograms of dexmedetomidine or a pharmaceutically acceptable salt thereof and about 16 mg buprenorphine or any similar amounts.

The drug combinations hereinabove may be included in a monolithic film of the present disclosure or a micro-deposition film of the present disclosure. If in a monolithic film, the present disclosure provides for the presence of all drugs in a single matrix film layer. The drugs may also be present in separate monolithic films which are then combined to provide a multi-layer film.

In one embodiment, and more conveniently, the drugs are included in a micro-deposition film of this disclosure. Thus, for example, individual drug compositions may be added as discrete droplets to the surface of the film substrate (i.e. placebo film) according to the general process used and described herein to add the dexmedetomidine composition to a film substrate. The droplets may be added in any pattern to suit the desired unit dose requirements. The droplets may each include a colorant which may be the same or different for each drug composition. It may be convenient to use different colors to distinguish the different drugs on the surface of the film substrate.

In one embodiment, we provide a method of treating agitation in a subject comprising administering to the subject a film of the present disclosure with concomitant exposure therapy.

In another embodiment, examples of suitable therapeutic agents to be combined with dexmedetomidine in the film composition include selective serotonin reuptake inhibitors (SSRIs) such as paroxetine, sertraline, serotonin and norepinephrine reuptake inhibitors (SNRIs) such as desipramine. In one embodiment, the present disclosure provides a film as disclosed herein, wherein the film comprises dexmedetomidine or a pharmaceutically acceptable salt thereof together with a selective serotonin reuptake inhibitor or a pharmaceutically acceptable salt thereof. In another embodiment, the present disclosure provides a film as disclosed herein, wherein the film comprises dexmedetomidine or a pharmaceutically acceptable salt thereof together with a serotonin and norepinephrine reuptake inhibitor or a pharmaceutically acceptable salt thereof.

In specific embodiment, the present disclosure provides a film as disclosed herein, wherein the film comprises dexmedetomidine or a pharmaceutically acceptable salt thereof together with desipramine or a pharmaceutically acceptable salt thereof

An effective amount of dexmedetomidine or a pharmaceutically acceptable salt thereof and ketamine or a pharmaceutically acceptable salt thereof may be included in the film of the present disclosure, so as to provide the desired effect.

Specific Embodiments

Embodiment 1. A pharmaceutical film composition suitable for sublingual administration, comprising:

-   -   (i) a therapeutically effective amount of dexmedetomidine or a         pharmaceutically acceptable salt thereof;     -   (ii) a polymer component consisting of one or more water-soluble         polymers; and     -   (iii) one or more pharmaceutically acceptable carriers.

Embodiment 2: A pharmaceutical film composition suitable for sublingual administration, consisting essentially of:

-   -   (i) a therapeutically effective amount of dexmedetomidine or a         pharmaceutically acceptable salt thereof;     -   (ii) a polymer component consisting of one or more water-soluble         polymers; and     -   (iii) one or more pharmaceutically acceptable carriers.

Embodiment 3. The pharmaceutical film composition according to Embodiment 1 or Embodiment 2, wherein said the polymer component consisting of at least two different water-soluble polymers.

Embodiment 4. The pharmaceutical film composition according to Embodiment 3, wherein the first water-soluble polymer has a molecular weight from about 5,000 daltons to about 49,000 daltons and one or more second water-soluble polymers each have a molecular weight greater than about 60,000 daltons.

Embodiment 5. The pharmaceutical film composition according to Embodiment 3 or Embodiment 4, wherein the ratio of first water-soluble polymer to second water-soluble polymer(s) (including PEO when present in the film) in the entire film composition is from about 1:10 to about 1:30, about 1:15 to about 1:25 or about 1:15 to about 1:20.

Embodiment 6. The pharmaceutical film composition according to Embodiment 4, wherein the first water-soluble polymer is selected from the group consisting of hydroxypropyl cellulose, hydroxypropyl methylcellulose, hydroxyethyl cellulose, carboxymethyl cellulose, methyl cellulose, and mixtures thereof.

Embodiment 7. The pharmaceutical film composition according to Embodiment 6, wherein the first water-soluble polymer consisting of hydroxypropyl cellulose and/or hydroxyethyl cellulose.

Embodiment 8. The pharmaceutical film composition according to Embodiment 4, wherein the one or more second water-soluble polymers is/are selected from the group consisting of polyethylene oxide, hydroxypropyl cellulose, hydroxypropyl methylcellulose, hydroxyethyl cellulose, carboxy methylcellulose, methylcellulose and mixtures thereof.

Embodiment 9. The pharmaceutical film composition according to Embodiment 7, wherein the second water-soluble polymer(s) is/are selected from hydroxypropyl cellulose, hydroxyethyl cellulose, polyethylene oxide and mixtures thereof.

Embodiment 10. The pharmaceutical film composition according to any of Embodiments 1 to 9, wherein the dexmedetomidine or a pharmaceutically acceptable salt thereof is dexmedetomidine hydrochloride.

Embodiment 11. The pharmaceutical film composition according to any of Embodiments 1 to 10 in the form of a dosage unit, wherein the amount of dexmedetomidine or a pharmaceutically acceptable salt thereof present per unit is from about 0.5 micrograms to about 150 micrograms, from about 1 microgram to about 100 micrograms, from about 3 micrograms to about 90 micrograms, from about 3 micrograms to about 80 micrograms, from about 3 micrograms to 70 micrograms, from about 3 micrograms to about 60 micrograms, from about 3 micrograms to 50 micrograms, about 3 micrograms to about 35 micrograms, from about 3 micrograms to about 50 micrograms, from about 5 micrograms to about 50 micrograms, from about 5 micrograms to about 45 micrograms, from about 3 micrograms to about 40 micrograms, from about 5 micrograms to about 35 micrograms, about 10 micrograms to about 50 micrograms, about 10 micrograms to about 40 micrograms, about 10 micrograms to about 35 micrograms, about 15 micrograms to about 35 micrograms or from about 15 micrograms to about 35 micrograms of dexmedetomidine or a pharmaceutically acceptable salt thereof

Embodiment 12. The pharmaceutical film composition according to any of Embodiments 1 to 11, wherein dexmedetomidine hydrochloride is present in an amount of from about 0.01% to about 50% based on the weight of the film on a dry weight basis, e.g. from about 0.05% to about 30% based on the weight of the film on a dry weight basis, e.g. from about 0.05% to about 20% based on the weight of the film on a dry weight basis.

Embodiment 13. The pharmaceutical film composition according to any of Embodiments 1 to 12, wherein the pharmaceutically acceptable carrier includes, but not limited to, one or more of liquid carriers, flavors, sweeteners, refreshing agents, pH adjusting agents, permeation enhancers, mucoadhesive agents, plasticizers, bulking agents, surfactants, anti-foaming agents, colorants or the like.

Embodiment 14. The pharmaceutical film composition according to any of Embodiments 1 to 13, wherein the film has a thickness of about 20 micrometers to about 1200 micrometers.

Embodiment 15. The pharmaceutical film composition according to any of Embodiments 1 to 14, wherein the film, when placed sublingually, will dissolve in about 10 seconds to about 180 seconds, e.g. about 60 seconds to about 180 seconds.

Embodiment 16. The pharmaceutical film composition according to any of Embodiments 1 to 15, wherein the film is mucoadhesive in nature.

Embodiment 17. The pharmaceutical film composition according to any of Embodiments 1 to 16, wherein the disintegration time of the film composition upon contacting simulated fluids is between about 10 seconds to about 180 seconds, about 15 seconds to about 180 seconds, about 30 seconds to about 180 seconds, about 45 seconds to about 180 seconds, about 60 seconds to about 180 seconds, or about 60 seconds to about 140 seconds; or the disintegration time of the film composition upon contacting simulated fluids is between about 15 seconds to about 180 seconds, about 15 seconds to about 160 seconds, about 25 seconds to about 150 seconds, about 15 seconds to about 140 seconds, about 15 seconds to about 120 seconds, about 40 seconds to about 120 seconds, about 50 seconds to about 120 seconds, for example about 120 seconds.

Embodiment 18: A process for preparing a pharmaceutical film composition comprises the steps of:

-   -   (i) preparing a mixture comprising dexmedetomidine or a         pharmaceutically acceptable salt thereof, a polymer         component(s), and one or more pharmaceutically acceptable         carriers including a liquid carrier and optionally one or more         other pharmaceutically acceptable carriers;     -   (ii) dispersing or casting the mixture on a substrate to form a         drug-containing polymer matrix; and     -   (iii) drying the drug-containing polymer matrix to remove at         least a portion of the liquid carrier to form a monolithic         drug-containing matrix film composition.

Embodiment 19: A process for preparing a pharmaceutical film composition comprises the steps of:

-   -   (i) preparing a monolithic matrix film composition according to         Embodiment 18, except that the composition does not contain any         dexmedetomidine or a pharmaceutically acceptable salt thereof         (i.e. a “placebo” film composition):     -   (ii) preparing a second composition comprising dexmedetomidine         or a pharmaceutically acceptable salt thereof together with one         or more pharmaceutically acceptable carriers including a liquid         carrier, and optionally one or more other pharmaceutically         acceptable carriers and/or a polymer component;     -   (iii) depositing the product of step (ii) onto the surface         “placebo” film composition of step (i), e.g. as one or more         droplets; and     -   (iv) drying the product of step (iii) to remove at least a         portion of the liquid carrier to form a matrix film composition         containing drug on the film surface.

Embodiment 20. The process according to Embodiment 19, wherein the second composition comprises a polymer component.

Embodiment 21. A method of treating agitation in a subject in need thereof, the method comprising administering to the subject a therapeutically effective amount of a pharmaceutical film composition according to any of Embodiments 1 to 15.

Embodiment 22. The method according to Embodiment 21, wherein the pharmaceutical film composition is placed in the mouth of the subject under the tongue.

Embodiment 23. The method according to Embodiment 21 or 22, wherein the agitation is associated neurodegenerative diseases selected from the group consisting of Alzheimer's disease, frontotemporal dementia (FTD), dementia, dementia with Lewy bodies (DLB), post-traumatic stress disorder (PTSD), Parkinson's disease, vascular dementia, vascular cognitive impairment, Huntington's disease, multiple sclerosis, Creutzfeldt-Jakob disease, multiple system atrophy, and progressive supranuclear palsy.

Embodiment 24. The method according to Embodiment 21 or 22, wherein the agitation is associated neuropsychiatric conditions selected from the group consisting of schizophrenia, bipolar disorder, bipolar mania, delirium, and depression.

Embodiment 25. The method according to Embodiment 21 or 22, wherein the agitation is associated with conditions such as OPD/IPD procedures (e.g. MRI, CT or CAT scan, lumbar puncture, bone marrow aspiration/biopsy, tooth extraction or other dental procedures).

Embodiment 26. The method according to Embodiment 21 or 22, wherein the agitation is associated with alcohol withdrawal, opioid use disorder, opioid withdrawal and substance abuse withdrawal.

Embodiment 27. The pharmaceutical film composition prepared according to Embodiment 18 or Embodiment 19, wherein said polymer component consisting of at least two different water-soluble polymers.

Embodiment 28. The pharmaceutical film composition according to Embodiment 27, wherein the first water-soluble polymer has a molecular weight from about 5,000 daltons to about 49,000 daltons and one or more second water-soluble polymers each have a molecular weight greater than about 60,000 daltons.

Embodiment 29. The pharmaceutical film composition according to Embodiment 18 or Embodiment 28, wherein the ratio of first water-soluble polymer to second water-soluble polymer(s) (including PEO when present in the film) in the entire film composition is from about 1:10 to 1:30, about 1:15 to about 1:25 or about 1:15 to about 1:20.

Embodiment 30. The pharmaceutical film composition according to Embodiment 19 or Embodiment 28, wherein the ratio of first water-soluble polymer to second water-soluble polymer(s) (including PEO when present in the film) in the polymer matrix composition (“placebo”) is from about 1:10 to 1:30, about 1:15 to about 1:25 or about 1:15 to about 1:20.

Embodiment 31. A method of treating agitation associated with opioid withdrawal in a subject in need thereof, the method comprising administering to the subject a therapeutically effective amount of a pharmaceutical film composition comprising an effective amount of dexmedetomidine or a pharmaceutically acceptable salt thereof and an effective amount of opioid antagonist.

Embodiment 32. A method of treating agitation associated with opioid withdrawal in a subject in need thereof, the method comprising administering to the subject a therapeutically effective amount of a pharmaceutical film composition comprising an effective amount of dexmedetomidine or a pharmaceutically acceptable salt thereof and an effective amount of partial agonist.

Embodiment 33. A method of treating agitation associated with post-traumatic stress disorder in a subject in need thereof, the method comprising administering to the subject a therapeutically effective amount of a pharmaceutical film composition comprising an effective amount of dexmedetomidine or a pharmaceutically acceptable salt thereof as adjunct therapeutic to exposure therapy.

Embodiment 34. A method of treating post-traumatic stress disorder in a subject in need thereof, the method comprising administering to the subject a therapeutically effective amount of a pharmaceutical film composition comprising an effective amount of dexmedetomidine or a pharmaceutically acceptable salt thereof as adjunct therapeutic to exposure therapy.

Embodiment 35. A method of treating post-traumatic stress disorder associated with opioid withdrawal in a subject in need thereof, the method comprising administering to the subject a therapeutically effective amount of a pharmaceutical film composition comprising an effective amount of dexmedetomidine or a pharmaceutically acceptable salt thereof.

Embodiment 36. A method of treating traumatic brain injury in a subject in need thereof, the method comprising administering to the subject a pharmaceutical film composition comprising an effective amount of dexmedetomidine or a pharmaceutically acceptable salt thereof.

EXAMPLES Example 1 Thin Film Formulations Formulation 1

TABLE 1 Dexmedetomidine hydrochloride dispersed within a polymer matrix film composition: Concentration Ingredients g/100 g Function Dexmedetomidine 3.60 Active hydrochloride Hydroxypropyl cellulose 4.82 Film former (MW = 40,000) Hydroxypropyl cellulose 4.82 Film former (MW = 140,000) Hydroxypropyl cellulose 28.94 Film former (MW = 370,000) Polyethylene oxide 57.84 Film former & (MW = 600,000) mucoadhesive Purified water* q.s. Solvent (or liquid carrier) *substantially removed via drying from the final formulation

Process: All the ingredients listed in table 1 were dissolved in water with stirring, cast through a fixed gap onto a release liner substrate to form a film, and subsequently dried in a lab oven at 70° C. for 30 minutes to provide a thin film product.

Formulation 2:

TABLE 2 Dexmedetomidine hydrochloride deposited on the surface of a polymer matrix film composition: Concentration Film Ingredients g/100 g Function Drug-containing composition Dexmedetomidine hydrochloride 0.48 Active Ethanol* q.s. Solvent Polymer matrix composition Hydroxypropyl cellulose 4.98 Film former (MW = 40,000) Hydroxypropyl cellulose 4.98 Film former (MW = 140,000) Hydroxypropyl cellulose 29.86 Film former (MW = 370,000) Polyethylene oxide 59.70 Film former & (MW = 600,000) mucoadhesive Purified water* q.s. Solvent (or liquid carrier) *substantially removed via drying from the final formulation

Process: All the polymers of the polymer matrix composition were dissolved in water with stirring, cast through a fixed gap onto a release liner substrate to form a film and subsequently dried in a lab oven at 70° C. for 30 minutes. Separately, dexmedetomidine hydrochloride was dissolved in ethanol on a vortex mixer and then deposited (as droplets) via volumetric pipette onto the film. Deposited drug composition was dried in a lab oven at 70° C. for five minutes to provide the thin film product.

Formulation 3:

TABLE 3 Dexmedetomidine hydrochloride deposited on the surface of a polymer matrix film composition: Concentration Ingredients g/100 g Function Drug-containing composition Dexmedetomidine 0.34 Active Sodium Chloride 0.10 pH neutralizing agent Sodium Hydroxide 0.65 pH neutralizing agent Ethanol* q.s. Solvent (or liquid carrier) Polymer matrix composition Hydroxypropyl cellulose 4.74 Film former (MW = 40,000) Hydroxypropyl cellulose 4.74 Film former (MW = 140,000) Hydroxypropyl cellulose 28.44 Film former (MW = 370,000) Polyethylene oxide 56.86 Film former & (MW = 600,000) mucoadhesive Glycine 3.80 Alkaline Buffer Sodium Hydroxide 0.33 Alkaline Buffer Purified water* q.s Solvent (or liquid carrier) *substantially removed via drying from the final formulation

Process: All the polymers and alkaline buffers of the polymer matrix composition were dissolved in water with stirring, cast through a fixed gap onto a release liner substrate to form a film and subsequently dried in a lab oven at 70° C. for 30 minutes. Separately, dexmedetomidine hydrochloride was dissolved in ethanol on a vortex mixer, neutralized with excess sodium hydroxide and sodium chloride and then deposited (as droplets) via volumetric pipette onto the film. Deposited drug composition was dried in a lab oven at 70° C. for five minutes to provide the thin film product.

Formulation 4:

TABLE 4 Dexmedetomidine hydrochloride deposited on the surface of a polymer matrix film composition: Concentration Ingredients g/100 g Function Drug-containing composition Dexmedetomidine hydrochloride 0.48 Active Hydroxypropyl cellulose 2.08 Film former (MW = 40,000) Ethanol q.s. Solvent (or liquid carrier) Polymer matrix composition Hydroxypropyl cellulose 4.87 Film former (MW = 40,000) Hydroxypropyl cellulose 4.87 Film former (MW = 140,000) Hydroxypropyl cellulose 29.23 Film former (MW = 370,000) Polyethylene oxide 58.47 Film former & (MW = 600,000) mucoadhesive Purified water q.s. Solvent (or liquid carrier)

Process: All the polymers of the polymer matrix composition were dissolved in water with stirring, cast through a fixed gap onto a release liner substrate to form a film and subsequently dried in a lab oven at 70° C. for 30 minutes. Separately, dexmedetomidine hydrochloride and hydroxypropyl cellulose (MW=40,000) were dissolved in ethanol on a vortex mixer and then deposited (as droplets) via volumetric pipette onto the film. Deposited drug composition was dried in a lab oven at 70° C. for five minutes to provide the thin film product.

Formulation 5:

TABLE 5 Dexmedetomidine hydrochloride deposited on the surface of a polymer matrix film composition: Concentration Ingredients g/100 g Function Drug-containing composition Dexmedetomidine hydrochloride 0.47 Active Hydroxypropyl cellulose 0.28 Film former (MW = 40,000) Hydroxypropyl cellulose 0.28 Film former (MW = 140,000) Hydroxypropyl cellulose 1.54 Film former (MW = 370,000) Ethanol q.s. Solvent (or liquid carrier) Polymer matrix composition Hydroxypropyl cellulose 4.87 Film former (MW = 40,000) Hydroxypropyl cellulose 4.87 Film former (MW = 140,000) Hydroxypropyl cellulose 29.23 Film former (MW = 370,000) Polyethylene oxide 58.46 Film former & (MW = 600,000) mucoadhesive Purified water q.s. Solvent (or liquid carrier)

Process: All the polymers of the polymer matrix composition were dissolved in water with stirring, cast through a fixed gap onto a release liner substrate to form a film and subsequently dried in a lab oven at 70° C. for 30 minutes. Separately, dexmedetomidine hydrochloride and the hydroxypropyl celluloses of the drug containing composition were dissolved in ethanol on a vortex mixer and then deposited (as droplets) via volumetric pipette onto the film. Deposited drug composition was dried in a lab oven at 70° C. for five minutes to provide the thin film product.

Formulation 6:

TABLE 6 Dexmedetomidine hydrochloride deposited on the surface of a polymer matrix film composition: Concentration Ingredients g/100 g Function Drug-containing composition Dexmedetomidine hydrochloride 0.48 Active Hydroxypropyl cellulose 0.26 Film former (MW = 40,000) Hydroxypropyl cellulose 0.26 Film former (MW = 140,000) Hydroxypropyl cellulose 1.57 Film former (MW = 370,000) Ethanol q.s. Solvent (or liquid carrier) Polymer matrix composition Peppermint Oil 2.06 Flavour Sucralose 0.97 Sweetener Fast Emerald Green 0.13 Colour Hydroxypropyl cellulose 4.7 Film former (MW = 40,000) Hydroxypropyl cellulose 4.7 Film former (MW = 140,000) Hydroxypropyl cellulose 28.29 Film former (MW = 370,000) Polyethylene oxide 56.58 Film former & (MW = 600,000) mucoadhesive Purified water q.s. Solvent (or liquid carrier)

Process: All the polymers and other ingredients of the polymer matrix composition were dissolved in water with stirring, cast through a fixed gap onto a release liner substrate to form a film and subsequently dried in a lab oven at 70° C. for 30 minutes. Separately, dexmedetomidine hydrochloride and hydroxypropyl celluloses of the drug containing composition were dissolved in ethanol on a vortex mixer and then deposited (as droplets) via volumetric pipette onto the film. Deposited drug composition was dried in a lab oven at 70° C. for five minutes to provide the thin film product.

Formulation 7:

TABLE 7 Dexmedetomidine hydrochloride deposited on the surface of a polymer matrix film composition: Concentration Ingredients g/100 g Function Drug-containing composition Dexmedetomidine hydrochloride 0.48 Active Hydroxypropyl cellulose 0.11 Film former (MW = 40,000) Hydroxypropyl cellulose 0.11 Film former (MW = 140,000) Hydroxypropyl cellulose 0.63 Film former (MW = 370,000) Polyethylene oxide 1.25 Film former (MW = 600,000) Ethanol q.s. Solvent (or liquid carrier) Purified water q.s. Solvent (or liquid carrier) Polymer matrix composition Hydroxypropyl cellulose 4.87 Film former (MW = 40,000) Hydroxypropyl cellulose 4.87 Film former (MW = 140,000) Hydroxypropyl cellulose 29.23 Film former (MW = 370,000) Polyethylene oxide 58.45 Film former & (MW = 600,000) mucoadhesive Purified water q.s. Solvent (or liquid carrier)

Process: All the polymers of the polymer matrix composition were dissolved in water with stirring, cast through a fixed gap onto a release liner substrate to form a film and subsequently dried in a lab oven at 70° C. for 30 minutes. Separately, dexmedetomidine hydrochloride and polymers of the drug containing composition were dissolved in a mixture of ethanol and water on a vortex mixer and then deposited (as droplets) via volumetric pipette onto the film. Deposited drug composition was dried in a lab oven at 70° C. for five minutes to provide the thin film product.

Formulation 8:

TABLE 8 Dexmedetomidine hydrochloride deposited on the surface of a polymer matrix film composition: Concentration Ingredients g/100 g Function Drug-containing composition Dexmedetomidine hydrochloride 0.49 Active Butanol q.s. Solvent (or liquid carrier) Polymer matrix composition Hydroxypropyl cellulose 4.98 Film former (MW = 40,000) Hydroxypropyl cellulose 4.98 Film former (MW = 140,000) Hydroxypropyl cellulose 29.85 Film former (MW = 370,000) Polyethylene oxide 59.70 Film former & (MW = 600,000) mucoadhesive Purified water q.s. Solvent (or liquid carrier)

Process: All the polymers of the polymer matrix composition were dissolved in water with stirring, cast through a fixed gap onto a release liner substrate to form a film and subsequently dried in a lab oven at 70° C. for 30 minutes. Separately, dexmedetomidine hydrochloride was dissolved in n-butanol on a vortex mixer and then deposited (as droplets) via volumetric pipette onto the film. Deposited drug composition was dried in a lab oven at 70° C. for five minutes to provide the thin film product.

Formulation 9:

TABLE 9 Dexmedetomidine deposited on the surface of a polymer matrix film composition: Concentration Ingredients g/100 g Function Drug-containing composition Dexmedetomidine 0.41 Active Sodium Chloride 0.12 pH neutralizing agent Hydroxypropyl cellulose 0.26 Film former (MW = 40,000) Hydroxypropyl cellulose 0.26 Film former (MW = 140,000) Hydroxypropyl cellulose 1.57 Film former (MW = 370,000) Ethanol q.s. Solvent (or liquid carrier) Polymer matrix composition Peppermint Oil 2.06 Flavour Sucralose 0.97 Sweetener Fast Emerald Green 0.13 Colour Hydroxypropyl cellulose 4.70 Film former (MW = 40,000) Hydroxypropyl cellulose 4.70 Film former (MW = 140,000) Hydroxypropyl cellulose 28.27 Film former (MW = 370,000) Polyethylene oxide 56.55 Film former & (MW = 600,000) mucoadhesive Purified water q.s. Solvent (or liquid carrier)

Process: All the polymers and other ingredients of the polymer matrix composition were dissolved in water with stirring, cast through a fixed gap onto a release liner substrate to form a film and subsequently dried in a lab oven at 70° C. for 30 minutes. Separately, dexmedetomidine, sodium chloride and the hydroxypropyl celluloses of the drug containing composition was dissolved in ethanol on a vortex mixer and then deposited (as droplets) via volumetric pipette onto the film. Deposited drug composition was dried in a lab oven at 70° C. for five minutes to provide the thin film product.

Formulation 10:

TABLE 10 Dexmedetomidine deposited on the surface of a polymer matrix film composition: Concentration Ingredients g/100 g Function Drug-containing composition Dexmedetomidine 0.34 Active Sodium Chloride 0.10 pH neutralizing agent Hydroxypropyl cellulose 0.22 Film former (MW = 40,000)

Process: All the polymers and other ingredients of the polymer matrix composition were dissolved in water with stirring, cast through a fixed gap onto a release liner substrate to form a film and subsequently dried in a lab oven at 70° C. for 30 minutes. Separately, dexmedetomidine, sodium chloride and the hydroxypropyl celluloses of the drug containing composition were dissolved in ethanol on a vortex mixer and then deposited (as droplets) via volumetric pipette onto the film. Deposited drug composition was dried in a lab oven at 70° C. for five minutes to provide the thin film product.

Formulation 11:

TABLE 11 Dexmedetomidine hydrochloride deposited on the surface of a polymer matrix film composition: Concentration Ingredients g/100 g Function Drug-containing composition Dexmedetomidine hydrochloride 0.38 Active Ethanol q.s. Solvent (or liquid carrier) Polymer matrix composition Hydroxypropyl cellulose 4.47 Film former (MW = 40,000) Hydroxypropyl cellulose 4.47 Film former (MW = 140,000) Hydroxypropyl cellulose 26.83 Film former (MW = 370,000) Polyethylene oxide 53.61 Film former & (MW = 600,000) mucoadhesive Sodium Lactate 6.52 Acidic Buffer Lactic Acid 3.72 Acidic Buffer Purified water q.s. Solvent (or liquid carrier)

Process: All the polymers and acidic buffer system of the polymer matrix composition were dissolved in water with stirring, cast through a fixed gap onto a release liner substrate to form a film and subsequently dried in a lab oven at 70° C. for 30 minutes. Separately, dexmedetomidine hydrochloride was dissolved in ethanol on a vortex mixer and then deposited (as droplets) via volumetric pipette onto the film. Deposited drug composition was dried in a lab oven at 70° C. for five minutes to provide the thin film product.

Formulation 12;

TABLE 12 Dexmedetomidine deposited on the surface of a polymer matrix film composition Concentration Concentration g/100 g g/100 g Ingredients (10 μg film) (20 μg film) Function Drug-containing composition Dexmedetomidine 0.136 0.267 Active agent hydrochloride Hydroxypropyl cellulose, 0.301 0.593 Film former HPC-SSL (MW = 40,000) Hydroxypropyl cellulose 0.301 0.593 Film former (MW = 140,000) FD&C Blue #1 Granular 0.002 0.004 Color Ethyl Alcohol as a solvent qs qs Solvent Polymer matrix composition Hydroxypropyl cellulose 4.803 4.768 Film former (MW = 140,000) Hydroxypropyl cellulose, 4.803 4.768 Film former HPC-SSL (MW = 40,000) Hydroxypropyl cellulose 28.809 28.601 Film former (MW = 370,000) Fast Emerald Green Shade 0.129 0.128 Color (NO. 06507) Sucralose, USP-NF Grade 0.993 0.985 Sweetener Peppermint Oil, NF 2.104 2.089 Flavor Polyethylene oxide 57.618 57.202 Film (Sentry Polyox WSR 205 former & LEO NF) Muco- (MW = 600,000) adhesive Water as a solvent qs qs Solvent

(A) Process for the Preparation of Polymer Matrix:

Polymer mixture: Polyethylene oxide and fast emerald green shade were mixed in water for at least 180 minutes at about 1400 rpm to about 2000 rpm. Sucralose, hydroxypropyl cellulose (molecular weight 140K), hydroxypropyl cellulose, HPC-SSL (molecular weight 40K) and hydroxypropyl cellulose (molecular weight 370K) were added and mixed for at least 120 minutes at about 1600 rpm to 2000 rpm. Peppermint Oil was added to water and the resultant dispersion was then added to the polymer mixture and mixed for at least 30 minutes. The resultant mixture was further mixed under vacuum (248 torr) for at least for 30 minutes at a speed of 350 rpm and at temperature of 22.9° C.

Coating station: A roll was placed on an unwind stand and the leading edge was thread through guide bars and coating bars. The silicone-coated side of the liner was placed faced up. A gap of 40 millimeters was maintained between the coating bars. The oven set point was adjusted to 70° C. and the final drying temperature was adjusted to 85° C.

Coating/drying process: The polymer mixture was poured onto the liner between the guide bars and the coating bars. The liner was pulled slowly through the coating bar at a constant speed by hand until no liquid was remained on the coating bars. The liner was cut to approximately 12-inch length hand sheets using a safety knife. Each hand sheet was placed on a drying board and was tapped on the corners to prevent curl during drying. The hand sheets were dried in the oven until the moisture content was less than 5% (approximately 30 minutes) and then removed from the drying board. The coating weights were checked against the acceptance criteria, and if met, the hand sheets were then stacked and placed in a 34 inch×40 inch foil bag that was lined with PET release liner.

(B) Process for the Preparation of Deposition Solution:

FDC blue was dissolved in ethyl alcohol for at least 180 minutes. Dexmedetomidine hydrochloride was added to the ethyl alcohol solution with continuous stirring for 10 minutes at about 400 rpm to about 800 rpm. Hydroxypropyl cellulose (40K) and hydroxypropyl cellulose (140K) were added to the mixture, and stirred for at least 30 minutes until all the materials were dissolved.

(C) Process for the Preparation of Micro-Deposited Matrix:

The deposition solution obtained in Step (B) above was filled into a pipette to the required volume (determined according to the specific drug product strength of the final product). An appropriate amount (1.5 microliters=approximately 5 micrograms) of the deposition solution were deposited (e.g. as droplets) onto the polymer matrix obtained in Step (A), and repeated to a total of 10 times (i.e. 10 deposits/droplets) with space between each deposit to prevent merging of the deposits/droplets and allow subsequent cutting of the film into individual drug-containing units. The film was initially die cut in individual units with dimensions of 22 mm×8.8 mm containing a single deposit of the drug-containing composition. The die cut micro-deposited matrixes were then dried in an oven for 70° C. for 10 minutes and further die cut into 10 units with each unit containing a single deposit of the drug-containing composition.

(D) Packaging:

Each defect-free unit was sealed individually into a foil pouch, which was then heat sealed. If the heat seal was acceptable the package was considered as an acceptable unit for commercial use.

Other unit strengths (e.g. 40 μg, 60 μg and 80 μg films) were similarly prepared by varying the concentrations of drug, polymers and colorant within the drug-containing composition. For example, the 40 μg, 60 μg and 80 μg films were prepared from drug-containing compositions containing, respectively, approximately 2×, 3×, and 4× the amounts of drug, polymers and colorant that appear in the 20 μg drug-containing composition described in Table 12 above.

Formulation 13:

TABLE 13 Dexmedetomidine deposited on the surface of a polymer matrix film composition Concentration Ingredients g/100 g Function Drug-containing composition Dexmedetomidine HCL 0.33 Active Ethanol q.s. Solvent (or liquid carrier) Polymer matrix composition Hydroxypropyl cellulose 4.99 Film former (MW = 40,000) Hydroxypropyl cellulose 4.99 Film former (MW = 140,000) Hydroxypropyl cellulose 29.90 Film former (MW = 370,000) Polyethylene oxide 59.79 Film former & (MW = 600,000) mucoadhesive Purified water q.s. Solvent (or liquid carrier)

Process: All the polymers of the polymer matrix composition were dissolved in water with stirring, cast through a fixed gap onto a release liner substrate to form a film and subsequently dried in a lab oven at 70° C. for 30 minutes. Separately, dexmedetomidine hydrochloride was dissolved in ethanol on a vortex mixer and then deposited (as droplets) via volumetric pipette onto the film. Deposited drug composition was dried in a lab oven at 70° C. for five minutes to provide the thin film product.

Formulation 14:

TABLE 14 Dexmedetomidine deposited on the surface of a polymer matrix film composition Concentration Ingredients g/100 g Function Drug-containing composition Dexmedetomidine 0.34 Active Sodium Chloride 0.10 pH neutralizing agent Hydroxypropyl cellulose 0.44 Film former (MW = 140,000) Hydroxypropyl cellulose 1.31 Film former (MW = 370,000) Ethanol q.s. Solvent (or liquid carrier) Polymer matrix composition Peppermint Oil 2.07 Flavour Sucralose 0.98 Sweetener Fast Emerald Green 0.13 Colour Hydroxypropyl cellulose 4.53 Film former (MW = 40,000) Hydroxypropyl cellulose 4.53 Film former (MW = 140,000) Hydroxypropyl cellulose 27.16 Film former (MW = 370,000) Polyethylene oxide 54.33 Film former & (MW = 600,000) mucoadhesive Glycine 3.76 Alkaline buffer Sodium hydroxide 0.32 pH neutralizing agent Purified water q.s. Solvent (or liquid carrier)

Process: All the polymers and other ingredients of the polymer matrix composition are dissolved in water with stirring, cast through a fixed gap onto a release liner substrate to form a film and subsequently dried in a lab oven at 70° C. for 30 minutes. Separately, dexmedetomidine, sodium chloride and the hydroxypropyl celluloses of the drug-containing composition are dissolved in ethanol on a vortex mixer and then deposited (as droplets) via volumetric pipette onto the film. Deposited drug composition is dried in a lab oven at 70° C. for five minutes to provide the thin film product.

Formulation 15:

TABLE 15 Dexmedetomidine deposited on the surface of a polymer matrix film composition Concentration Ingredients g/100 g Function Drug-containing composition Dexmedetomidine 0.34 Active Sodium chloride 0.10 pH neutralizing agent Hydroxypropyl cellulose 1.75 Film former (MW = 140,000) Ethanol q.s. Solvent (or liquid carrier) Polymer matrix composition Peppermint Oil 2.07 Flavour Sucralose 0.98 Sweetener Fast Emerald Green 0.13 Colour Hydroxypropyl cellulose 4.53 Film former (MW = 40,000) Hydroxypropyl cellulose 4.53 Film former (MW = 140,000) Hydroxypropyl cellulose 27.16 Film former (MW = 370,000) Polyethylene oxide 54.33 Film former & (MW = 600,000) mucoadhesive Glycine 3.76 Alkaline buffer Sodium hydroxide 0.32 pH neutralizing agent Purified water q.s. Solvent (or liquid carrier)

Process: All the polymers and other ingredients of the polymer matrix composition are dissolved in water with stirring, cast through a fixed gap onto a release liner substrate to form a film and subsequently dried in a lab oven at 70° C. for 30 minutes. Separately, dexmedetomidine, sodium chloride and hydroxypropyl cellulose (MW=140,000) of the drug containing composition are dissolved in ethanol on a vortex mixer and then deposited (as droplets) via volumetric pipette onto the film. Deposited drug composition is dried in a lab oven at 70° C. for five minutes to provide the thin film product.

Formulation 16:

The formulation was prepared as described in Table 16.

TABLE 16 Dexmedetomidine hydrochloride deposited on the surface of a polymer matrix film composition Concentration Ingredients g/100 g Function Drug-containing composition Dexmedetomidine hydrochloride 0.48 Active Hydroxypropyl cellulose 2.09 Film former (MW = 140,000) Ethanol q.s. Solvent (or liquid carrier) Polymer matrix composition Peppermint Oil 2.06 Flavour Sucralose 0.97 Sweetener Fast Emerald Green 0.13 Colour Hydroxypropyl cellulose 4.7 Film former (MW = 40,000) Hydroxypropyl cellulose 4.7 Film former (MW = 140,000) Hydroxypropyl cellulose 28.29 Film former (MW = 370,000) Polyethylene oxide 56.58 Film former & (MW = 600,000) mucoadhesive Purified water q.s. Solvent (or liquid carrier)

Process: All the polymers and other ingredients of the polymer matrix composition are dissolved in water with stirring, cast through a fixed gap onto a release liner substrate to form a film and subsequently dried in a lab oven at 70° C. for 30 minutes. Separately, dexmedetomidine hydrochloride and hydroxypropyl cellulose of the drug containing composition are dissolved in ethanol on a vortex mixer and then deposited (as droplets) via volumetric pipette onto the film. Deposited drug composition is dried in a lab oven at 70° C. for five minutes to provide the thin film product.

Formulation 17:

TABLE 17 Dexmedetomidine hydrochloride deposited on the surface of a polymer matrix film composition Concentration Ingredients g/100 g Function Drug-containing composition Dexmedetomidine hydrochloride 0.48 Active Hydroxypropyl cellulose 0.52 Film former (MW = 140,000) Hydroxypropyl cellulose 1.57 Film former (MW = 370,000) Ethanol q.s. Solvent (or liquid carrier) Polymer matrix composition Peppermint Oil 2.06 Flavour Sucralose 0.97 Sweetener Fast Emerald Green 0.13 Colour Hydroxypropyl cellulose 4.7 Film former (MW = 40,000) Hydroxypropyl cellulose 4.7 Film former (MW = 140,000) Hydroxypropyl cellulose 28.29 Film former (MW = 370,000) Polyethylene oxide 56.58 Film former & (MW = 600,000) mucoadhesive Purified water q.s. Solvent (or liquid carrier)

Process: All the polymers and other ingredients of the polymer matrix composition are dissolved in water with stirring, cast through a fixed gap onto a release liner substrate to form a film and subsequently dried in a lab oven at 70° C. for 30 minutes. Separately, dexmedetomidine hydrochloride, and hydroxypropyl celluloses of the drug containing composition are dissolved in ethanol on a vortex mixer and then deposited (as droplets) via volumetric pipette onto the film. Deposited drug composition is dried in a lab oven at 70° C. for five minutes to provide the thin film product.

Formulation 18:

TABLE 18 Dexmedetomidine hydrochloride deposited on the surface of a polymer matrix film composition Concentration Ingredients g/100 g Function Drug-containing composition Dexmedetomidine 0.48 Active hydrochloride Hydroxypropyl 0.26 Film former cellulose (MW = 40,000) Hydroxypropyl 0.26 Film former cellulose (MW = 140,000) Hydroxypropyl 1.57 Film former cellulose (MW = 370,000) Ethanol q.s. Solvent (or liquid carrier) Polymer matrix composition Peppermint Oil 2.06 Flavour Sucralose 0.97 Sweetener Fast Emerald 0.13 Colour Green Hydroxypropyl 18.845 Film former cellulose (MW = 40,000) Hydroxypropyl 18.845 Film former cellulose (MW = 140,000) Polyethylene 56.58 Film former & oxide mucoadhesive (MW = 600,000) Purified water q.s. Solvent (or liquid carrier)

Process: All the polymers and other ingredients of the polymer matrix composition are dissolved in water with stirring, cast through a fixed gap onto a release liner substrate to form a film and subsequently dried in a lab oven at 70° C. for 30 minutes. Separately, dexmedetomidine hydrochloride, and the hydroxypropyl celluloses of the drug containing composition are dissolved in ethanol on a vortex mixer and then deposited (as droplets) via volumetric pipette onto the film. Deposited drug composition is dried in a lab oven at 70° C. for five minutes to provide the thin film product.

Formulation 19:

TABLE 19 Dexmedetomidine hydrochloride deposited on the surface of a polymer matrix film composition Concentration Ingredients g/100 g Function Drug-containing composition Dexmedetomidine 0.48 Active hydrochloride Hydroxypropyl 2.09 Film former cellulose (MW = 40,000) Ethanol q.s. Solvent (or liquid carrier) Polymer matrix composition Peppermint Oil 2.06 Flavour Sucralose 0.97 Sweetener Fast Emerald Green 0.13 Colour Hydroxypropyl 18.845 Film former cellulose (MW = 40,000) Hydroxypropyl 18.845 Film former cellulose (MW = 140,000) Polyethylene oxide 56.58 Film former & (MW = 600,000) mucoadhesive Purified water q.s. Solvent (or liquid carrier)

Process: All the polymers and other ingredients of the polymer matrix composition are dissolved in water with stirring, cast through a fixed gap onto a release liner substrate to form a film and subsequently dried in a lab oven at 70° C. for 30 minutes. Separately, dexmedetomidine hydrochloride, and hydroxypropyl cellulose of the drug containing composition are dissolved in ethanol on a vortex mixer and then deposited (as droplets) via volumetric pipette onto the film. Deposited drug composition is dried in a lab oven at 70° C. for five minutes to provide the thin film product.

Formulation 20:

TABLE 20 Dexmedetomidine hydrochloride deposited on the surface of a polymer matrix film composition Concentration Ingredients g/100 g Function Drug-containing composition Dexmedetomidine 0.48 Active hydrochloride Hydroxypropyl 2.09 Film former cellulose (MW = 40,000) Ethanol q.s. Solvent (or liquid carrier) Polymer matrix composition Peppermint Oil 2.06 Flavour Sucralose 0.97 Sweetener Fast Emerald Green 0.13 Colour Hydroxypropyl 19.27 Film former cellulose (MW = 40,000) Polyethylene oxide 75.00 Film former & (MW = 600,000) mucoadhesive Purified water q.s. Solvent (or liquid carrier)

Process: All the polymers and other ingredients of the polymer matrix composition are dissolved in water with stirring, cast through a fixed gap onto a release liner substrate to form a film and subsequently dried in a lab oven at 70° C. for 30 minutes. Separately, dexmedetomidine hydrochloride, and hydroxypropyl cellulose of the drug containing composition are dissolved in ethanol on a vortex mixer and then deposited (as droplets) via volumetric pipette onto the film. Deposited drug composition is dried in a lab oven at 70° C. for five minutes to provide the thin film product.

Formulation 21:

TABLE 21 Dexmedetomidine hydrochloride deposited on the surface of a polymer matrix film composition Concentration Ingredients g/100 g Function Drug-containing composition Dexmedetomidine 0.48 Active hydrochloride Hydroxypropyl 0.26 Film former cellulose (MW = 40,000) Hydroxypropyl 0.26 Film former cellulose (MW = 140,000) Hydroxypropyl 1.57 Film former cellulose (MW = 370,000) Ethanol q.s. Solvent (or liquid carrier) Polymer matrix composition Peppermint Oil 2.06 Flavour Sucralose 0.97 Sweetener Fast Emerald Green 0.13 Colour Polyethylene oxide 94.27 Film former & (MW = 600,000) mucoadhesive Purified water q.s. Solvent (or liquid carrier)

Process: Polyethylene oxide and other ingredients of the polymer matrix composition are dissolved in water with stirring, cast through a fixed gap onto a release liner substrate to form a film and subsequently dried in a lab oven at 70° C. for 30 minutes. Separately, dexmedetomidine hydrochloride and hydroxypropyl celluloses of the drug containing composition were dissolved in ethanol on a vortex mixer and then deposited (as droplets) via volumetric pipette onto the film. Deposited drug composition was dried in a lab oven at 70° C. for five minutes to provide the thin film product.

Formulation 22:

TABLE 22 Dexmedetomidine hydrochloride deposited on the surface of a polymer matrix film composition Concentration Ingredients g/100 g Function Drug-containing composition Dexmedetomidine 0.48 Active hydrochloride Hydroxypropyl 0.26 Film former cellulose (MW = 40,000) Hydroxypropyl 0.26 Film former cellulose (MW = 140,000) Hydroxypropyl 1.57 Film former cellulose (MW = 370,000) Ethanol q.s. Solvent (or liquid carrier) Polymer matrix composition Peppermint Oil 2.06 Flavour Sucralose 0.97 Sweetener Fast Emerald Green 0.13 Colour Hydroxypropyl 94.27 Film former cellulose (MW = 370,000) Purified water q.s. Solvent (or liquid carrier)

Process: Hydroxypropyl cellulose and other ingredients of the polymer matrix composition are dissolved in water with stirring, cast through a fixed gap onto a release liner substrate to form a film and subsequently dried in a lab oven at 70° C. for 30 minutes. Separately, dexmedetomidine hydrochloride and hydroxypropyl cellulose of the drug containing composition are dissolved in ethanol on a vortex mixer and then deposited (as droplets) via volumetric pipette onto the film. Deposited drug composition is dried in a lab oven at 70° C. for five minutes to provide the thin film product.

Formulation 23:

TABLE 23 Dexmedetomidine hydrochloride deposited on the surface of a polymer matrix film composition Concentration Ingredients g/100 g Function Drug-containing composition Dexmedetomidine 0.48 Active hydrochloride Hydroxypropyl 0.26 Film former cellulose (MW = 40,000) Hydroxypropyl 0.26 Film former cellulose (MW = 140,000) Hydroxypropyl 1.57 Film former cellulose (MW = 370,000) Ethanol q.s. Solvent (or liquid carrier) Polymer matrix composition Peppermint Oil 2.06 Flavour Sucralose 0.97 Sweetener Fast Emerald Green 0.13 Colour Hydroxypropyl 94.27 Film former cellulose (MW = 140,000) Purified water q.s. Solvent (or liquid carrier)

Process: Hydroxypropyl cellulose and other ingredients of the polymer matrix composition are dissolved in water with stirring, cast through a fixed gap onto a release liner substrate to form a film and subsequently dried in a lab oven at 70° C. for 30 minutes. Separately, dexmedetomidine hydrochloride and hydroxypropyl celluloses of the drug containing composition are dissolved in ethanol on a vortex mixer and then deposited (as droplets) via volumetric pipette onto the film. Deposited drug composition is dried in a lab oven at 70° C. for five minutes to provide the thin film product.

Example 2 Ex-Vivo Permeation of Formulations 1 to 13 of Example 1 Compared to PRECEDEX®

Formulations 1 to 13 were evaluated on an or mucosal cell model as a proxy for drug absorption (EpiOral™; MatTek Corp., Ashland, Mass.) tissue to determine the diffusion rates and extent:

ORL-200 24-well plates (MatTek Corp) containing oral cell tissue cultures were utilized within 1 day of receipt and following equilibration overnight in a 5% CO₂ chamber set to 37° C. and 95% relative humidity. 300 microliters of TEER-Buffer [DPBS containing Ca2+ and Mg2+ and 3.6 mg/mL glucose] was added to each well within a 24-well plate and placed in the CO₂ chamber overnight. The following morning the tissue inserts were removed from the TEER-Buffer and placed into a new 24-well plate containing 300 microlitres of DPBS receiver media. Prior to dosing with Formulations 1 to 13 and Precedex®, TEER was measured on each tissue insert to ensure viability following the equilibration.

Each insert was pre-wetted with 25 microliters DPBS prior to applying Formulations 1 to 13 and Precedex® to the donor side of the tissue insert, followed by an additional 25 microliters of DPBS onto the top of each formulation. Prior to applying Formulations 1 to 13 to the tissue inserts, Formulations 2 to 13 were die-cut to 52.65 mm² and Formulation 1 was die-cut to 13.125 mm². The units were die-cut to deliver the intended dose as specified below.

The 24-well plate containing each tissue insert was returned to the incubator for the specified time and subsequently removed from the incubator following the elapsed time. The tissue inserts were transferred to a fresh 24-well plate containing 300 microliters of receiver media and returned to the incubator for the additional specified time. 300 microliters receiver media from each well of the 24-well plate was transferred to HPLC vials and stored in the refrigerator (1 day) until analyzed via UPLC/MS. This experimental sequence was repeated for all time points.

Results: Table 24 illustrates the assay values and estimated AUCs (nanograms) of Formulations 1 to 13 and Precedex®. Table 24 further illustrates the disintegration time of Formulations 1, 2, 3, 7 and 13. Table 25 elucidates the diffusion of Formulations 1 to 13 and Precedex®, and FIG. 3 presents the diffusion data visually for Formulations 1 to 7, 11 and Precedex®. Each of Formulations 1 to 10 and 12 performed better than Precedex®. For example, the rate and extent of dexmedetomidine permeability through oral cell culture tissue from Formulations 1 to 10 and 12 was in the range of 1.5 to 4.5 times the rate and extent of dexmedetomidine permeability from Precedex®.

TABLE 24 Illustrates the assay values, disintegration time, and estimated AUCs of Formulations 1 to 13 and Precedex ® Assay Mean Estimated Formulation (micrograms) Disintegration Normalized flux AUC No. Average SD Time (sec) (ng/cm²) (ng)  1 10.16 0.27 13 46,402 10,277  2 6.718 0.58 59 43,491 5673  3 8.975 0.86 83 61,954 8274  4 6.63 1.01 — 5936  5 6.51 1.75 — 5886  6 10.58 NA — 8209  7 6.84 1.14 64 Mean flux- 5077 103,319  8 11.9 37.5 — 10,116  9 9.37 NA — 9171 10 9.74 NA — 8356 12 Assay of 1.54 Mean Estimated AUC 20 mcg Normalized flux (ng) of 10 mcg film of 10 mcg film film 20.432 46,644 9061 13 2.725 1.37 35 43,113 2718 Precedex — — N/A 4894 (100 μg/mL) Comparative 8.402 1.20 — 1924 Formulation 11

Table 25: Elucidates the diffusion of Formulations 1 to 13 (average cumulative amount) and Precedex® through an oral cell culture membrane:

TABLE 25 Elucidates the diffusion of Formulations 1 to 13 (average cumulative amount) and Precedex ® through an oral cell culture membrane: Time (h) 0 0.08 0.25 0.5 0.75 1 Average Cumulative Formulation 1 0 1378 3355 5019 6245 7137 amount (ng) (10 μg) Formulation 2 0 405 1402 2435 3262 3890 (10 μg) Formulation 3 0 132 1123 2615 3916 5197 (10 μg) Formulation 4 0 384 1383 2481 3384 4044 (10 μg) Formulation 5 0 279 1196 2340 3272 3971 (10 μg) Formulation 6 0 721 1759 3586 5197 5810 (10 μg) Formulation 7 0 348 1186 2120 2734 3354 (10 μg) Formulation 8 0 611 2122 3838 5439 6690 (10 μg) Formulation 9 0 801 1737 3207 4976 6120 (10 μg) Formulation 10 0 530 1091 2364 4226 5408 (10 μg) Precedex ® 0 159 727 1353 2200 2893 (100 μL, 10 μg) Formulation 11 0 27.9 40 409 698 1035 (10 μg) Formulation 12 0 426.5 1968.5 3679.7 5088.7 6210.5 (10 μg) Formulation 13 0 183.7 657.7 1087.8 1476.8 1809 (10 μg)

Estimated AUC: Estimated area under the flux/time curve from the data using the trapezoidal rule which confers to total drug diffused.

Example 3 Pharmacokinetics in Rabbits (Study 1)

-   -   Test Animal Description:     -   Species: Oryctolagus cuniculus     -   Initial Age: Commensurate with weight     -   Sex: Male     -   Breed: New Zealand White     -   Initial Body Weight: ˜1.5-4 kg     -   Replicates per Treatment: N=5 per dose group, total 30 rabbits         (non-crossover)     -   Washout Interval: Minimum 3 day washout

Study design was as follows: Food was withheld from the animals for a minimum of 12 hours prior to study initiation and four hours post-dosing. Prior to dosing, animals were weighed and assigned to experimental groups, stratified according to body weight. Individual doses were calculated based on body weights recorded on the day of dose administration. Animals were anesthetized by isoflurane. Formulations 1, 2, 3, 7 and 13 were administered under the tongue (SL) of the animals. Precedex® was administered via a butterfly needle followed by a 1 mL saline flush or via straight stick in the ear vein. Blood samples were collected pre-dosing, and at 10 minutes, 20 minutes, 30 minutes, 1 hour, 2 hours, 4 hours and 8 hours post-dosing. Blood samples were stabilized and kept cold until analysis. Bioassays were performed using C18RP-HPLC-MS. The concentrations were measured in plasma samples using a standard LC/MS/MS method against calibration curves with a minimum of six points (N=1).

Study design and PK parameters for various formulations are provided in Table 26 and Table 27 respectively:

TABLE 26 depicts the non-crossover study design: Group Test Dosing Animals Dosing Dosing Number Article Route N = Dose Conc. Volume Vehicle 1 Precedex ® IV 5 1.5 μg/kg 4.0 μg/mL 0.375 mL/kg 0.9% NaCl 2 Formulation 1  SL 5 10 μg 10 μg — — 3 Formulation 2  SL 5 10 μg 10 μg — — 4 Formulation 7  SL 5 10 μg 10 μg — — 5 Formulation 3  SL 5 10 μg 10 μg — — 6 Formulation 13 SL 5 10 μg 10 μg — —

Table 27: depicts the summary of Mean Pharmacokinetic Parameters for dexmedetomidine hydrochloride after intravenous and sublingual administration in Male New Zealand White Rabbits with average body weight ranged from 2.96 to 3.34 kg:

TABLE 27 depicts the summary of Mean Pharmacokinetic Parameters for dexmedetomidine hydrochloride after intravenous and sublingual administration in Male New Zealand White Rabbits with average body weight ranged from 2.96 to 3.34 kg: Dexmedetomidine Group 1 Group 2 Group 3 Group 4 Group 5 Group 6 hydrochloride Precedex ® Formulation 1 Formulation 2 Formulation 7 Formulation 3 Formulation 13 Route Intravenous Sublingual Sublingual Sublingual Sublingual Sublingual Dose 1.5 μg/kg 10 μg 10 μg 10 μg 10 μg 10 μg C_(max) (pg/mL) 738 220 112 235 88.9 75.2 t_(max) (hr) 0.00 0.767 0.600 0.900 0.567 1.13 MRT_(last) (hr) 0.325 1.14 1.16 1.46 1.51 1.06 AUC_(last) 161 359 149 426 151 92.6 (hr · pg/mL) C_(max): maximum plasma concentration; t_(max): time of maximum plasma concentration; MRT_(last): mean residence time, calculated to the last observable time point; AUC_(last): area under the curve, calculated to the last observable time point;

Result summary: The sublingual film products (Formulations 1, 2 and 7) provided exposure levels of dexmedetomidine hydrochloride in rabbits that are similar to the IV route of administration, when normalized to dose. Based upon mean animal mass at 3.34 kg in Group 1, the IV bolus dose administered was about 5 μg. AUC for the IV product was 161 h·pg.mL in the rabbit study while sublingual film products dosed at twice the strength (10 micrograms) of the IV product gave twice the AUC (range 359-426 h·pg.mL). Therefore, the delivery of dexmedetomidine hydrochloride via the films provided exposures equivalent to an IV dose.

Example 4 Pharmacokinetics in Rabbits (Study 2) Test Animal Description:

-   -   Species: Oryctolagus cuniculus     -   Initial Age: Commensurate with weight     -   Sex: Male     -   Breed: New Zealand White     -   Initial Body Weight: ˜2.9-3.9 kg     -   Replicates per Treatment: N=8 per dose group, total 64 rabbits         (non-crossover)     -   Washout Interval: Minimum 7 day washout     -   Blood Sampling Time Points: Pre-dose, 5, 10, 20, 30 min, 1, 2,         4, and 8 hours post dose

Study design was as follows: Animals were anesthetized with isoflurane, prior to dose administration. Dosing formulations were administered sublingually (SL) with the film or Precedex® drops placed in the sublingual space (underneath the tongue of the animal). Micro-deposited films in dose groups were administered sublingually with the letter ‘P’ facing up (away from the mucosal tissue). Animals in the Precedex® injection dose group were anesthetized via isoflurane and Precedex with 0.9% NaCl was administered via a syringe and 25 gauge needle into the marginal ear vein. The time course began with test article placement (T0). The animals were left anesthetized and in a sternal position with its head propped up for 30 minutes to ensure TA dose does not move (T0-T30). After the dosing period, the sublingual space was not wiped and the animals were recovered (T30).

Blood samples were collected from the rabbits via the ear vessel, jugular vein, or other suitable vessels via direct venipuncture, and then placed into chilled polypropylene tubes containing K2EDTA as an anticoagulant. Samples were maintained chilled throughout processing. Blood samples were centrifuged at 4° C. and 3,000×g for 5 minutes. Plasma was then transferred to a chilled, labeled polypropylene tube, placed on dry ice, and stored in a freezer maintained at −60° C. to −80° C. pending analysis.

Plasma Samples:

Whole blood samples (˜2.0 mL) were collected from the rabbits via jugular vein or another suitable vessel at the appropriate time points and placed into tubes containing K2EDTA as the anticoagulant and inverted several times to mix. Blood samples were centrifuged at a temperature of 4° C. at 3000×g for 5 minutes. All samples were maintained chilled throughout processing. The resulting plasma samples were transferred into polypropylene tubes and placed in a freezer set to maintain −60 to −80° C. until shipment to the Sponsor's bioanalytical lab for analysis.

Study design and PK para meters for various formulations are provided in Table 28 and Table 29 respectively.

TABLE 28 depicts the non-crossover study design: Test Article Film Type: Formulation # Description Micro Micro Identical to formulation 12 SL film containing 1.47 μg deposited -1 deposited in composition dexmedetomidine Micro Micro Identical to formulation 12 SL film containing 2.94 μg deposited -2 deposited in composition dexmedetomidine Micro Micro Identical to formulation 12 SL film containing 5.88 μg deposited -3 deposited in composition dexmedetomidine Micro Micro Identical to formulation 12 SL film containing 8.82 μg deposited -4 deposited in composition dexmedetomidine Monolith 1 Monolith Identical to formulation 1 SL film containing 5.88 μg in composition dexmedetomidine Monolith 2 Monolith Identical to formulation 1 SL film containing 8.82 in composition dexmedetomidine Precedex Solution for SL Reference SL SL solution containing (100 μg/mL) Drops Drops 100 μg/mL dexmedetomidine Precedex Solution for Reference 4 μg/mL dexmedetomidine (4 μg/mL) IV Injection Injection solution for IV injection Period 2 Results (Minimum 7-day Washout) Precedex Solution for Reference 4 μg/mL dexmedetomidine (4 μg/mL) IV Injection Injection solution for IV injection Precedex Solution for Reference 4 μg/mL dexmedetomidine (4 μg/mL) IV Injection Injection solution for IV injection Precedex Solution for Reference 4 μg/mL dexmedetomidine (4 μg/mL) IV Injection Injection solution for IV injection

TABLE 29 depicts Arithmetic Mean Pharmacokinetic Results from SL Administration of Dexmedetomidine Containing Films or Precedex ® Micro- Micro- Micro- Micro - deposited deposited deposited deposited Monolithic Monolithic film 1 film 2 film 3 film 4 film 1 film 2 SL film SL film SL film SL film SL film SL film containing containing containing containing containing containing 1.47 μg 2.94 μg 5.88 μg 8.82 μg 5.88 μg 8.82 μg Prece- dexmedeto- dexmedeto- dexmedeto- dexmedeto- dexmedeto- dexmedeto- dex Parameters midine midine midine midine midine midine SL Dose (μg/kg) 0.471 0.939 1.79 2.65 1.83 2.70 2.71 Cmax (ng/mL) 0.157 0.112 0.119 0.315 0.142 0.205 0.290 tmax (h) 1.06 1.56 0.833 1.25 0.667 0.688 0.396 AUClast 0.145 0.094 0.206 0.618 0.224 0.344 0.335 (hr · ng/mL) Cmax/Dose 0.333 0.119 0.066 0.119 0.078 0.076 0.107 AUClast/Dose 0.308 0.100 0.115 0.233 0.122 0.127 0.124 F % 110% 52.2% 70.5% 83.4% 63.4% 45.6% 44.2% ²F % was calculated using individual animal IV data as a crossover.

Results: The systemic exposure of dexmedetomidine following sublingual dosing showed a numeric trend for higher exposures from increased doses from micro-deposited matrix films 2, 3 and 4. Micro-deposited matrix film 1 showed a greater than dose proportional C_(max) and AUC_(last) compared to Micro-deposited matrix films 2-4. The Monolithic films 1 and 2 showed an approximate dose proportional increase in C_(max) and AUC_(last). The systemic exposure of dexmedetomidine following sublingual dosing showed a numeric trend for higher exposures from increased doses from Micro-deposited matrix films 2, 3 and 4. Micro-deposited matrix films 1 showed a greater than dose proportional C_(max) and AUC_(last) compared to Micro-deposited matrix films 2-4. The Monolithic films 1 and 2 showed an approximate dose proportional increase in C_(max) and AUC_(last). The resulting F % values for the SL films showed higher results as compared to the Precedex SL dosing. Micro-deposited matrix films 1 and 4, which showed a 2.5 and 1.9 fold higher F % compared to the Precedex SL dosing which could be attributed to not have crossover IV data for the animals in these groups.

Example 5 Evaluation of the Films

TABLE 30 Formulation 12 evaluated for various parameters, including stability studies and results Parameters Formulation 12 Formulation 12 Strength (mcg) Specification 10 mcg 20 mcg Appearance Green rectangular thin film Pass Pass with one blue spot Size (mm) Width: 22 mm ± 1.5 mm Width - 22.3 mm Width - 22.2 mm Length: 8.8 mm ± 0.5 mm Length - 9.2 mm Length - 9.1 mm Assay (%) 90%-110% 105.3% 101.0% Uniformity of USP<905> Average (10): 105.8% Average (10): dosage (%) Stage 1-10 of 10 specimens AV:10 99.4% (Average) AV ≤ 15 AV:7 Stage 2 (if required) - 30 of 30 specimens AV ≤ 25 Related Hydroxymedetomidine (1- ND ND substances (2,3-Dimethylphenyl)-1- (1H-imidazole-5-yl) ethanol) ≤ 1.0% N-Benzylhydroxymedeto- ND ND midine (1-(1-Benzyl-1H- imidazol-5-yl)-1-(2,3- dimethylphenyl)ethanol) ≤ 1.0% Ethylmedetomidine (5-[1- ND ND (2,3-Dimethylphenyl)- ethyl]-1-ethyl-1H- imidazole) ≤ 1.0% N-Benzylmedetomidine ND ND (1-Benzyl-5-[1-(2,3- dimethylphenyl)ethyl]-1H- imidazole) ≤ 1.0% N-Benzyl vinyl analog (1- ND ND Benzyl-5-[1-(2,3- dimethylphenyl)vinyl]-1H- imidazole) ≤ 1.0% Any Unspecified ND ND Degradant ≤ 1.0% Total Degradant ≤ 5.0% 0.0% ND Dissolution (Q ≥ 80% in 15 minutes) 104.2% 102.3% Disintegration (USP<701> NMT 3 Pass Pass time Minutes) Burst strength (g) — Average Average (n = 3):605.891 g (n = 3):503.286 g Mucoadhesion (g) — Average peak force Average peak force (Average peak (n = 3): 436.011 g (n = 3): 105.937 g force) Mucoadhesion — Average AUC (n = 3): Average AUC (g*sec) (Average 21.739 g*sec (n = 3): 4.702 g*sec AUC) Water activity ≤0.75 A_(w) Average (n = 3): 0.44 Average (n = 3): 0.37 Microbial Limits Total Aerobic Microbial <200 cfu/film (10 <200 cfu/film (10 Count < 200 cfu/film film) film) Total Combined Yeast & <20 cfu/film (10 film) <20 cfu/film (10 molds Count < 20 cfu/film film) Pseudomona aeruginosa ND ND Negative/10 units Staphylococcus aureus ND ND Negative/10 units

Stability data: Formulation 1 (Monolithic film) and Formulation 12 [Micro-deposited matrix film (60 mcg)] were packaged individually in foil pouches. The films were tested for stability by subjecting the packaged films to temperatures of 25° C. and 40° C. After 6 months the films were evaluated with respect to various parameters. The results are provided in Table 31 and Table 32.

TABLE 31 depicts stability data for the micro deposited matrix film (Formulation 12) Dexmedetomidine 60 mcg sublingual film Micro-deposited film stored at 25° C./60% RH Micro-deposited film stored at 40° C./75% RH Parameters Specification 0 month 1 month 3 months 6 months 0 month 1 month 3 months 6 months Appearance Green rectangular Pass Pass Pass Pass Pass Pass Pass Pass film with one spot Assay 90%-110% 100.6.% 98.2% 102.3% 99.4% 100.6% 102.2% 98.8% 94.3% Related Hydroxy- ND ND ND ND ND ND ND ND substance medetomidine ≤ 1% N-Benzyl-Hydroxy- ND ND ND ND ND ND ND ND medetomidine ≤ 1% Ethyl- ND ND ND ND ND ND ND ND medetomidine ≤ 1% N-Benzyl- ND ND ND ND ND ND ND ND medetomidine ≤ 1% N-Benzyl- ND ND ND ND ND ND ND ND vinyl Analog ≤ 1% Any unspecified ND ND ND ND ND ND ND ND degradant ≤ 1% Total    0%   0%    0%   0%    0%    0%   0%    0% degradant ≤ 5% Dissolution Q ≥ 80% in  97.1% 97.0%  94.8% 99.6%  97.1%  95.2% 93.8% 96.1% 15 min Disin- USP <701> 36-169 sec 59-122 sec 24-97 sec 9-36 sec 36-169 sec 20-107 sec 26-107 sec 4-31 sec tegration NMT 3 min Burst — 476.230 g 526.415 g 343.996 g 320.074 g 476.230 g 413.866 g 92.133 g 57.735 g Strength Muco- Peak 510.173 g 110.010 g 84.040 g 76.815 g 510.173 g 198.586 g 234.896 g 64.687 g adhesion AUC 31.307 g*s 4.839 g*s 3.583 g*s 4.024 g*s 31.307 g*s 10.158 g*s 13.046 g*s 2.424 g*s Water ≤0.75a_(w) 0.44 0.39 0.41 0.41 0.44 0.40 0.38 0.43 activity Microbial Total aerobic Pass NA NA NA Pass NA NA NA limits microbial < 200 cfu/film Total combined Pass NA NA NA Pass NA NA NA Yeasts and Molds < 20 cfu/film Pseudomonas Pass NA NA NA Pass NA NA NA aeruginosa Negative/10 units Staphylococcus Pass NA NA NA Pass NA NA NA aureus Negative/10 units

TABLE 32 depicts stability data for the monolithic film (similar to Formulation 1-different in strength) Dexmedetomidine 60 mcg sublingual film Monolithic film stored at 25° C./60% RH Monolithic film stored at 40° C./75% RH Parameters Specification 0 month 1 month 2 months 6 months 0 month 1 month 2 months 6 months Appearance Green Green Green Green Green Green Green Green rectangular rectangular rectangular rectangular rectangular rectangular rectangular rectangular thin film thin film thin film thin film thin film thin film thin film thin film Assay 89.4 Not done 88.0 85.6 89.4 77.0 71.8 71.9 Related substance Hydroxymedetomidine ND Not done ND 0.3 ND 0.7 0.5 0.3 N-Benzyl-hydroxy- ND Not done ND ND ND ND ND ND medetomidine Ethylmedetomidine ND Not done ND ND ND ND ND ND N-Benzyl-medetomidine ND Not done ND ND ND ND ND ND N-Benzyl-vinyl analog ND Not done ND ND ND ND ND ND Unknown A ND Not done ND ND ND ND 0.2 0.8 (Vinylmedetomidine) Total impurities 0.0 Not done ND 0.3 ND 0.7 0.7 0.8 Dissolution at 15 minutes 87.1 Not done ND 64.7 87.1 71.1 NA 79.4 Disintegration (sec) 35,00 24.33 19.00 17.00 35,00 8.33 10.00 11.30 Tensile Strength (g) 482.27 472.37 662.84 428.79 482.27 18.3 14.22 14.46 Mucoadhesion (g) 1646.85 1004.67 1228.72 882.54 1646.85 836.64 791.90 762.82

Conclusion: Micro-deposited matrix films, as exemplified by Formulation 12, are more stable than monolithic films, as exemplified by Formulation 1, when stored at 25° C. and 40° C. up to 6 months.

Example 6: Phase 1, Randomized, Single-Blind, Placebo-Controlled, Single Ascending Dose Study of the Pharmacokinetics, Safety & Tolerability of Dexmedetomidine Sublingual Film (Formulation 12) in Healthy Adult Volunteers

This was a randomized, single-blind, placebo-controlled, single ascending dose pharmacokinetics, safety and tolerability study with 4 dosing groups in healthy adult (18-65 years-old) males and females. The study protocol was reviewed and approved by an institutional review board of site(s). This study was conducted in accordance with the Declaration of Helsinki and ICH-Good Clinical Practices (GCP).

Four (4) doses were evaluated derived from three film strengths of 10 μg, 40 μg, and 60 μg: 10 μg, 20 μg (2×10 μg film), 40 μg, and 60 μg in Cohort 1, 2, 3 and 4 respectively. All eligible participants, who have been previously screened, arrived at the clinical research unit (CRU) a day before for admission and baseline assessment. They were domiciled in the CRU for 4 days (Day −1, 1, 2 and 3) and discharged on Day 4, and were under medical supervision during this time. The pre-dose evaluation of all the participants was done approximately between 07:00 and 09:00 hours, after an overnight fast of at least 8 hours. The participants were given free access to drinking water until at least one hour before dosing. A venous catheter was inserted for allowing sampling for PK. At the beginning of each study session, a single dose of dexmedetomidine sublingual film (Formulation 12) was administered sublingually by an unblinded staff. The dexmedetomidine sublingual film was retained in the sublingual cavity until dissolved. Evaluations were done every 5 minutes for the first 15 minutes and then every 15 minutes to determine the time to dissolution of the film. The ECG, BP and oxygen saturation were monitored as per the schedule. Participants were allowed water as desired at least 1 hour after drug administration. Standard meals were offered at approximately 4, 8, and 12 hours after dexmedetomidine sublingual film dosing. After plasma sampling for 24 hours following dosing of dexmedetomidine sublingual film, the safety and tolerability assessments were continued until the morning of Day 4 (day of discharge), and were repeated again on Day 5, Day 7±1 and Day 14±2. Blood samples were collected immediately prior to dosing (baseline) and 5, 10, 20, 30, 60, 90, 120, 180, 240 min. Additional blood samples were collected at 5, 6, 8, 10, 12 and 24 hours post dose for a total of 16 PK sampling time points.

Number of Participants:

The study evaluated increasing doses of dexmedetomidine sublingual film (Formulation 12) in 4 cohorts of healthy adult participants. In the first two cohorts (Cohort 1 and Cohort 2), twelve (12) new participants were enrolled per cohort, randomized in a ratio of 2:1, i.e. 8 receiving dexmedetomidine sublingual film and 4 receiving Placebo film.

Participants who received active treatment and completed the treatment in Cohort 1, i.e. not discontinued or withdrew, received active treatment in Cohort 3. In addition to the participants who crossed over from Cohort 1 to Cohort 3, six new participants were enrolled in Cohort 3. Similarly, participants who received active treatment and completed the treatment in Cohort 2, i.e. not discontinued or withdrew, received active treatment in Cohort 4. In addition to the participants who crossed over from Cohort 2 to Cohort 4, six new participants were enrolled in Cohort 4.

Participants that dropped out receiving placebo in Cohorts 1 and 2 were replaced by patients to receive placebo when they crossed over, i.e., in the event that placebo participants dropped out, when crossing over from Cohort 1 to Cohort 3 or Cohort 2 to Cohort 4, additional new participants were added to make up the total participants to four (4) in the placebo arms of Cohort 3 and Cohort 4.

Inclusion Criteria:

-   -   1. Healthy males and non-pregnant/non-breast-feeding females         between 18 and 65 years of age, both inclusive.     -   2. Participants who were capable of giving written informed         consent for the study     -   3. Participants that had body weight ≥50 kg with body mass index         (BMI) in the range of 19-30 kg/m2, both inclusive     -   4. Participants having physical examination and vital signs         judged to be within normal limits by the PI or designee     -   5. Participants whose clinical laboratory tests (complete blood         count, blood chemistry, and urinalysis) were within normal         limits or are clinically acceptable to the PI or designee     -   6. Participants who were sufficiently physically healthy to         receive a SL dose strength of dexmedetomidine sublingual film,         and tolerate drowsiness, in the opinion of the PI or designee.     -   7. Participants who were fluent in English and have ability to         understand written and verbal protocol-related requirements in         English     -   8. Participants who were willing and able to be confined to the         CRU for approximately 4-5 days per dosing cohort and comply with         the study schedule and study requirements.     -   9. Participants that had reliable intravascular access from         which to draw blood samples.     -   10. Male participants, if non-vasectomized, must agree to use a         condom with spermicide or abstain from sexual intercourse,         during the trial and for 3 months after stopping the medication.     -   11. Male participant must not donate sperm starting at screening         and throughout the study period, and for 90 days after the final         study drug administration.     -   12. For female participants of child-bearing potential, the         participant must be willing to practice a clinically accepted         method of birth control from at least 30 days prior to the first         administration of the study medication, during the study, and         for at least 30 days after the last dose of the study         medication.     -   13. For female of non-childbearing potential, the participant         was surgically sterile (i.e. has undergone hysterectomy,         bilateral oophorectomy, or tubal ligation) or in a menopausal         state (at least 1 year without menses), as confirmed by FSH         levels.

Exclusion Criteria:

-   -   1. The participants with a history of allergic reaction or         intolerance to the study drug or related compounds and         additives.     -   2. The participants with a history of major surgery within 4         weeks of screening     -   3. The participants with a history of significant traumatic         brain injury     -   4. The participants with a history of alcohol or drug dependence         by Diagnostic and Statistical Manual of Mental Disorders IV         criteria during the 6-month period prior to study entry.     -   5. The participants with a history of or presence of clinically         significant psychiatric illnesses mental retardation, borderline         personality disorder, anxiety disorder, or organic brain         syndrome     -   6. The participants with a history of orthostatic hypotension         (i.e., a sustained reduction of systolic BP (SBP) of at least 20         mmHg or diastolic BP (DBP) of 10 mmHg, or both, within 3 min of         standing or head-up tilt to at least 600 on a tilt table) and         high vagal tone     -   7. The participants who regularly consume large amounts of         xanthine-containing substances (i.e., more than 5 cups of coffee         or equivalent amounts of xanthine-containing substances per         day).     -   8. The participants who were on maintenance medications that         could inhibit or induce the CYP2A6 enzyme and other medications         as listed in Appendix 15.1.     -   9. The participants who had received dexmedetomidine or other         alpha-2-agonists within 1 week of the study date.     -   10. The participants who had clinically significant sleep apnea         or chronic obstructive pulmonary disease or history of asthma     -   11. The participants with suicidal tendency in the judgement of         the PI or designee     -   12. The participants with clinical laboratory abnormalities         (including positivity for Hep B, Hep C, HIV) unless treated to         remission status.     -   13. The participants with abnormal vital signs measurement in         the judgement of the PI or designee, unless treated to remission         status.     -   14. The participants those were enrolled in another clinical         study (e.g., laboratory or clinical evaluation) or have received         an investigational drug in the past 30 days (or within 5         half-lives of the investigational drug, if >30 days).     -   15. The participants that had a resting heart rate of <65 beats         per minute or SBP<110 mmHg or >140 mmHg or DBP<70 mmHg or >100         mmHg at screening and pre-dosing. Have evidence of a clinically         significant 12 lead ECG abnormality. Subjects that previously         failed eligibility criteria at the Screening visit or Day 1         predose due to Exclusion 15 for a resting heart rate <70 beats         per minute but not <65 beats per minute may be rescreened.     -   16. The participants with an aberrant oral/buccal anatomy,         inflammation or pathology which in the opinion of the PI, may         affect SL drug administration and absorption.     -   17. The participants with hepatic impairment or who have hepatic         dysfunction defined as a history of hepatic dysfunction and an         Alanine Aminotransferase (ALT) and Aspartate Aminotransferase         (AST) values greater than 2 times normal in the past 6 months         prior to study drug administration.     -   18. The participants who had donated blood within 30 days prior         to screening or plasma donation within 7 days prior to         screening.     -   19. The participant who was part of the study staff personnel or         family members of the study staff personnel.

Study duration: 39-42 days.

Dosing:

Cohort 1, Cohort 2, Cohort 3 and Cohort 4 were given 10 μg, 20 μg (2×10 μg films), 40 μg and 60 μg dose of dexmedetomidine sublingual films (Formulation 12) and accompanying Placebo respectively. Except for the first dose cohort (10 μg dose), each subsequent dose level was authorized after safety review of the previous dosing cohort. Dosing was done only once to each cohort. Dexmedetomidine sublingual film (having dot) was different from placebo in appearance.

End Points:

1. Area under the curve (AUC0-12, AUC0-24, AUC0-∞) for 0 to 12 hours and 0-24 hours post dosing for Dexmedetomidine plasma concentration, peak plasma Dexmedetomidine concentration (Cmax), time to peak Dexmedetomidine concentration level (Tmax), terminal half-life (t1/2) of Dexmedetomidine, volume of distribution of Dexmedetomidine and clearance of Dexmedetomidine (CL).

Results:

TABLE 33 summarizes pharmacokinetics parameters of 10 micrograms dexmedetomidine sublingual film in healthy volunteers 10 micrograms dexmedetomidine sublingual film Subject Cmax Tmax t_(1/2) AUC_(last) AUC0-INF ID (ng/L) (hr) (hr) (hr*ng/L) (hr*ng/L) 1001 37.94 1.5 2.06 179.19 201.32 1002 18.27 1.00 1.17 49.45 58.27 1005 33.28 2.00 1.86 116.63 140.07 1007 35.74 2.00 2.95 142.22 168.59 1009 24.15 3.02 2.70 102.76 147.74 1011 30.87 1.00 2.75 114.35 138.82 1012 24.53 1.50 2.58 98.28 132.11 1016 35.19 2.00 1.24 119.28 129.17 N 8 8 8 8 8 Mean 29.996 1.752 2.163 115.271 139.512 SD 6.930 0.659 0.693 37.049 40.525 CV % 23.1 37.6 32.0 32.1 29.0 Min 18.27 1.00 1.17 49.45 58.27 Median 32.08 1.75 2.32 115.49 139.45 Max 37.94 3.02 2.95 179.19 201.32 Geometric 29.214 1.648 2.051 109.219 132.838 Mean Geometric 25.79 39.08 37.61 38.59 37.6 CV %

TABLE 34 summarizes pharmacokinetics parameters of 20 micrograms dexmedetomidine sublingual film in healthy volunteers 20 micrograms dexmedetomidine sublingual film Subject Cmax Tmax t_(1/2) AUC_(last) AUC0-INF ID (ng/L) (hr) (hr) (hr*ng/L) (hr*ng/L) 2001 0.00 0.00 0.00 2003 83.08 1.00 2.2 359.59 389.48 2004 65.17 2.00 1.72 259.5 279.49 2007 84.90 1.50 1.60 401.79 416.92 2011 70.76 2.00 1.85 309.75 337.01 2013 85.92 1.00 1.85 307.97 330.48 2016 42.34 3.00 1.97 198.79 225.81 2106 66.75 1.50 1.57 283.34 301.60 N 8 7 7 8 8 Mean 62.365 1.714 1.824 265.092 285.099 SD 28.982 0.699 0.221 123.337 129.906 CV % 46.5 40.8 12.1 46.5 45.6 Min 0.00 1.00 1.57 0.00 0.00 Median 68.76 1.50 1.85 295.66 316.04 Max 85.92 3.00 2.20 401.79 416.92 Geometric 1.601 1.813 Mean Geometric 41.30 11.95 CV %

TABLE 35 summarizes pharmacokinetics parameters of 40 micrograms dexmedetomidine sublingual film in healthy volunteers 40 micrograms dexmedetomidine sublingual film Subject Cmax Tmax AUC_(last) AUC0-INF ID (ng/L) (hr) t_(1/2) (hr*ng/L) (hr*ng/L) 3011 140.25 1.00 1.78 685.15 709.61 3012 78.69 2.00 2.00 427.97 461.18 3013 97.01 1.07 1.76 292.84 310.29 3023 126.60 1.00 1.86 493.89 508.98 3026 135.02 1.50 1.38 482.44 499.41 3032 78.06 2.00 3.38 378.67 439.85 3114 167.99 1.00 2.05 777.66 806.08 3131 123.52 2.02 2.42 600.88 627.60 4001 109.62 1.00 1.82 419.51 446.40 4022 204.03 1.00 1.82 664.47 704.50 4026 123.68 2.00 1.83 507.83 534.00 4130 143.95 2.00 1.97 772.97 798.78 N 12 12 12 12 12 Mean 127.368 1.465 2.007 542.024 570.557 SD 35.794 0.495 0.496 157.144 156.810 CV % 28.1 33.8 24.7 29.0 27.5 Min 78.06 1.00 1.38 292.84 310.29 Median 125.14 1.28 1.85 500.86 521.49 Max 204.03 2.02 3.38 777.66 806.08 Geometric 122.839 1.389 1.961 520.580 550.254 Mean Geometric 28.87 35.22 21.81 30.84 29.15 CV %

TABLE 36 Evaluation of RASS Score in the First 2 Hours - Pharmacodynamics Population Parameters 10 mcg 20 mcg 40 mcg Placebo Evaluable patients 8 8 12 14 per RASS Number of patients 2 4 4 3 who have reached at least RASS of −1 at any time in the first 2 hours Number of patients 1 0 0 1 who have reached a RASS of −2 at any time in the first 2 hours

Results: The data given in the tables 33 to 35 reflects the dose proportional pharmacokinetics. This data clearly shows that pharmacodynamics effects lasts for 4 to 6 hours which is consistent with the optimal treatment window. Dexmedetomidine plasma concentrations increase rapidly following placement of the film formulation and achieve plasma exposures to produce the pharmacodynamic effect. The half-life of dexmedetomidine sublingual film Formulation 12 is comparable to IV dexmedetomidine. FIG. 4 reflects the mean dexmedetomidine plasma log concentration vs. time for 10, 20 and 40 mcg of dexmedetomidine sublingual film (semi-log scale) and clearly demonstrates that 70-80% of the mean concentrations were achieved before 1 hour of dexmedetomidine film administration. Further data revealed that dexmedetomidine sublingual thin film (Formulation 12) was safe and well tolerated with no serious adverse events. All adverse events were transient and mild (below grade 2) except moderate headache (2 in placebo group), moderate systolic/diastolic decrease (1 in placebo), and moderate dizziness (2 subjects in 40 μg group with orthostatic changes). Only drowsiness and dizziness were seen at rates greater than 1-2 subjects per group, thus there is no clear sedative effect. vs. placebo. The most common adverse event seen was drowsiness, observed at rates similar to placebo. Lower rates of dizziness were reported in all groups, and was greater than placebo only for 40 μg group. The study demonstrated that mean cardiovascular changes were not clinically meaningful and the maximum tolerated dose as not reached. The data is further depicted in FIGS. 5 to 11 .

Example 7: A Phase Ib Multicenter, Randomized, Double-Blind, Placebo-Controlled, Multiple Ascending Dose Study to Determine Efficacy, Pharmacokinetics and Safety of Dexmedetomidine Sublingual Film in Agitation Associated with Schizophrenia

Adaptive evaluation of escalating dose regimens of 20 μg, 60 μg and 120 μg were performed for the first stage, with an option to test a different dose should a safety or tolerability signal be observed. Male and female adults with acute agitation associated with schizophrenia, schizoaffective disorder, or schizophreniform disorder were enrolled in each cohort. Investigators chose to repeat the 20 μg dose 1 hour after initial administration.

TABLE 37 Arms and Interventions Arms Intervention Placebo Comparator: Placebo Drug: Placebo film Sublingual Film with no active Placebo film for dexmedetomidine drug; single administration hydrochloride Experimental: 20 micrograms Drug: Sublingual film containing Sublingual Film containing 20 dexmedetomidine hydrochloride micrograms dexmedetomidine; Administration: Sublingual film single administration with containing dexmedetomidine for repeat dose after 1 hour the treatment of agitation associated with Schizophrenia Experimental: 60 micrograms Drug: Sublingual film containing Sublingual Film containing 60 dexmedetomidine hydrochloride. micrograms dexmedetomidine; Administration: Sublingual film single administration containing dexmedetomidine for the treatment of agitation associated with Schizophrenia Experimental: 120 micrograms Drug: Sublingual film containing 2 Sublingual Films, each dexmedetomidine hydrochloride. containing 60 micrograms Administration: Sublingual film dexmedetomidine; single containing dexmedetomidine for the administration of 2 films treatment of agitation associated with Schizophrenia

Blinded periodic safety data reviews were undertaken on an ongoing basis to review all subjects assigned, dosed and as data became available. Dose escalation was allowed unless a safety or tolerability issue became evident upon periodic regular safety review. Each site was assigned a small number of each dose cohort in an escalating although blinded fashion such that a given cohort was balanced between sites to account for subject-site and inter-rater variability. Patients at a site were assigned to the lowest dose cohort with subsequent patients assigned to increasing doses. This sequential escalating adaptive enrollment ensures subject safety; the lowest dose cohort completes accrual first, higher dose cohorts complete last. Should a subject not respond, the investigator might repeat the dose such that the subject receives a second administration (and no further) of the same randomized dose thereby testing the safety/efficacy of receiving two doses separated by 1 hour which approximates dosing before initiating the next dose level cohort. Sequential accrual of subjects in the high dose cohort enables more rapid discontinuation of dosing, exposing only a minimum number of subjects, should dose-limiting safety or tolerability be observed. Further, based upon blinded analyses integrating PK, exposure and the safety/tolerability of all subjects and doses, the dose regimen may be altered (e.g. repeated dosing may be discontinued or allowed only after an elapsed time), or different dose may be selected to test the hypothesis that a (typically lower) dose regimen is better tolerated.

Eligible subjects were randomized to dexmedetomidine sublingual film (Formulation 12) or Placebo. At the beginning of each study session, a single dose of dexmedetomidine sublingual film (Formulation 12) was self-administered sublingually by the patient, after training with a placebo film and under the supervision of an unblinded staff who had not participated in evaluation of safety or efficacy.

Dexmedetomidine sublingual film (Formulation 12) was retained in the sublingual cavity until dissolved. Participants were evaluated for local irritation around the area where the film was placed. Efficacy and safety assessments were conducted periodically before and after dosing. If reduction in PEC is less than or equal to 40% one hour after the first administration, the investigator may request a second dose of dexmedetomidine sublingual film be administered (of the same randomized dose) with an additional PEC assessment completed at 1.5 hours post-dose. Should the patient's situation warrant it, standard of care treatment may be initiated, e.g. after the 4 hours assessments are completed.

Stage 1: In each cohort twenty-seven (27) new participants were enrolled, randomized 2:1 Dexmedetomidine sublingual film: Placebo film, i.e. 18 received dexmedetomidine sublingual film and 9 received placebo film. Three doses were initially planned (total of 81 subjects). A different or additional dose may be tested based on ongoing safety reviews. At the conclusion of Stage 1, two doses that describe a safe and effective range (High and Low) will selected based upon blinded review of the overall clinical safety, tolerability, adverse effects and PK observed during dosing.

Stage 2: In order to more accurately estimate the range of safety tolerability and calming effects observed upon exposing greater numbers of subjects, an additional 120 subjects are enrolled in a double blind placebo controlled parallel group sequential 3-arm design testing each of two identified effective doses or placebo (randomized 1:1:1 High:Low:placebo with 40 subjects per arm; total 120 subjects in Stage 2; Study total of approximately 201 subjects).

Vital Signs and ECG with rhythm strip are measured as per schedule of assessments, prior to any PK assessments. Participants are allowed water as desired 30 minutes after completion of dosing. Standard meals may be offered beginning 1 hour after dexmedetomidine sublingual film dosing. Safety and tolerability assessments are continued until the morning of Day 3 (day of discharge) and will be repeated again on Day 7(+2).

Approximately 4 mL of venous blood (to obtain a minimum of 1.2 mL plasma) will be taken into K2-EDTA tubes at set time intervals for the determination of plasma concentrations of study drug (or Placebo). The PK plasma samples should be collected within 5 minutes of the scheduled sampling time on Day 1. Blood samples will be collected per Table 3-1 Schedule of Events.

Number of subjects (planned): An estimated 201 subjects (81 in stage 1 and 120 in stage 2) are enrolled at approximately 12-20 study sites in the United States.

Diagnosis and Main Criteria for Eligibility:

Inclusion Criteria:

-   -   1. Male and female patients between the ages of 18 to 65 years,         inclusive.     -   2. Patients who have met DSM-5 criteria for schizophrenia,         schizoaffective, or schizophreniform disorder.     -   3. Patients who are judged to be clinically agitated at Baseline         with a total score of ≥14 on the 5 items (poor impulse control,         tension, hostility, uncooperativeness, and excitement)         comprising the PANSS Excited Component (PEC).     -   4. Patients who have a score of ≥4 on at least 1 of the 5 items         on the PEC.     -   5. Patients who read, understand and provide written informed         consent.     -   6. Patients who are in good general health prior to study         participation as determined by a detailed medical history,         physical examination, 12-lead ECG with rhythm strip, blood         chemistry profile, hematology, urinalysis and in the opinion of         the Principal Investigator.     -   7. Female participants, if of child-bearing potential and         sexually active, and male participants, if sexually active with         a partner of child-bearing potential, who agree to use a         medically acceptable and effective birth control method         throughout the study and for one week following the end of the         study. Medically acceptable methods of contraception that may be         used by the participant and/or his/her partner include         abstinence, birth control pills or patches, diaphragm with         spermicide, intrauterine device (IUD), condom with foam or         spermicide, vaginal spermicidal suppository, surgical         sterilization and progestin implant or injection. Prohibited         methods include: the rhythm method, withdrawal, condoms alone,         or diaphragm alone.

Exclusion Criteria:

-   -   1. Patients with agitation caused by acute intoxication,         including positive identification of alcohol by breathalyzer or         non-prescription drugs (with the exception of THC) during urine         screening.     -   2. Patients treated within 4 hours prior to study drug         administration with benzodiazepines, other hypnotics or oral or         short-acting intramuscular antipsychotics.     -   3. Treatment with alpha-1 noradrenergic blockers (terazosin,         doxazosin, tamsulosin, and alfuzosin, and prazocin) or other         prohibited medications.     -   4. Patients with significant risk of suicide or homicide per the         investigator's assessment, or any suicidal behaviour in last 6         months prior to screening.     -   5. Female patients who have a positive pregnancy test at         screening or are breastfeeding.     -   6. Patients who have hydrocephalus, seizure disorder, or history         of significant head trauma, stroke, transient ischemic attack,         subarachnoid bleeding, brain tumor, encephalopathy, meningitis,         Parkinson's disease or focal neurological findings.     -   7. History of syncope or other syncopal attacks, current         evidence of hypovolemia, orthostatic hypotension, a screening         heart rate of <55 beats per minutes or systolic blood pressure         <110 mmHg or diastolic BP<70 mmHg.     -   8. Patients with laboratory or ECG abnormalities considered         clinically significant by the investigator or qualified designee         [Advanced heart block (second-degree or above atrioventricular         block without pacemaker), diagnosis of Sick sinus syndrome] that         would have clinical implications for the patient's participation         in the study.     -   9. Patients with serious or unstable medical illnesses. These         include current hepatic (moderate severe hepatic impairment),         renal, gastroenterologic, respiratory, cardiovascular (including         ischemic heart disease, congestive heart failure),         endocrinologic, or hematologic disease.     -   10. Patients who have received an investigational drug within 30         days prior to the current agitation episode.     -   11. Patients who are unable to use the sublingual film or         considered by the investigator, for any reason, to be an         unsuitable candidate for receiving dexmedetomidine; e.g.         patients with a history of allergic reactions to         dexmedetomidine.

Test Product, Dose, and Mode of Administration:

Dexmedetomidine sublingual film (Formulation 12) is tested in a small, solid-dose film formulation, approximately 193.6 mm² in area and 0.7 mm thick, designed to completely dissolve in the SL space within 2-3 minutes.

Reference Therapy, Dosage and Mode of Administration:

Matching placebo films to be taken sublingually as described above.

Duration of Treatment: 1 day

Criteria for Evaluation

Efficacy assessment: Assessment of drug effects on acute agitation done by the Positive and Negative Syndrome Scale—Excited Component (PEC). The PEC comprises 5 items associated with agitation: poor impulse control, tension, hostility, uncooperativeness, and excitement; each scored 1 (minimum) to 7 (maximum). The PEC, the sum of these 5 subscales, thus ranges from 5 to 35.

Overall agitation and sedation will be evaluated with the Agitation-Calmness Evaluation Scale (ACES), where 1 indicates marked agitation; 2—moderate agitation; 3—mild agitation; 4—normal behavior; 5—mild calmness; 6—moderate calmness; 7—marked calmness; 8—deep sleep; and 9—unarousable. The change in agitation in response to treatment will also be measured by the Clinical Global Impressions—Improvement (CGI-I). CGI-I scores range from 1 to 7: 0=not assessed (missing), 1=very much improved, 2=much improved, 3=minimally improved, 4=no change, 5=minimally worse, 6=much worse, 7=very much worse.

Safety and tolerability assessments: AEs, clinical laboratory tests, ECG with rhythm strip, and vital signs are monitored for tolerability assessment. All observed and volunteered AEs are recorded. The relationship of AEs to the study drugs are graded as not related, unlikely/remotely related, possibly related, probably related or definitely related by the investigators. Vital signs including systolic blood pressure (SBP), diastolic blood pressure (DBP), and heart rate are measured prior to the PK blood samples. The application site of the SL preparation (buccal mucosa) is inspected for any signs of local irritation.

Additional Assessments:

-   -   Demographic Data     -   Medical History     -   Prior and Concomitant Medication     -   Physical Examination     -   Pregnancy

Efficacy Analyses: The primary efficacy endpoint for Stage 1 is the proportion of subjects at each dose that achieve a 40% reduction in PEC at 2 hr. The primary efficacy endpoint for Stage 2 is the absolute change from baseline in the PEC total score at 2 hr.

Sample Size Determination: The study is not powered for detecting statistically significant differences in efficacy parameters. However, cohorts of up to 27 subjects (2:1 ratio of dexmedetomidine sublingual film:placebo) are sufficient to characterize the safety, tolerability and PK profile in Stage 1. In Stage 2, cohorts of 40 subjects are enrolled (40 on high dexmedetomidine sublingual film dose, 40 on low dexmedetomidine sublingual film dose, 40 on placebo).

Results of Stage 1

TABLE 38 Summary statistics of PK parameter estimates Dose Re- Tmax Cmax t_(1/2) AUC_(last) AUC_(INF)_obs Cohort (ug) dose Statistics (hr) (ng/L) (hr) (hr*ng/L) (hr*ng/L) 1 20 No N 10 10 9 10 9 Mean 1.895 39.898 3.313 171.639 246.444 SD 0.813 15.019 1.021 57.654 63.994 CV % 42.9 37.6 30.8 33.6 26.0 Min 1.00 14.07 2.12 57.43 145.57 Median 1.74 37.02 3.17 180.09 241.74 Max 4.02 69.05 5.36 264.45 332.10 Geometric Mean 1.778 37.157 3.183 160.056 238.688 Geometric CV % 36.99 43.89 30.51 45.41 27.86 1 20 Yes N 8 8 7 8 7 Mean 2.935 96.589 2.946 586.103 499.866 SD 2.077 36.954 0.857 556.166 226.187 CV % 70.8 38.3 29.1 94.9 45.2 Min 1.83 49.87 1.81 230.06 294.47 Median 2.31 104.54 3.01 444.23 520.36 Max 8.03 138.69 4.02 1912.52 939.05 Geometric Mean 2.578 89.711 2.833 453.552 461.828 Geometric CV % 50.30 44.50 31.46 78.77 44.05 2 60 No N 18 18 17 18 17 Mean 1.528 139.589 2.861 681.542 792.552 SD 0.689 47.223 1.381 482.593 525.000 CV % 45.1 33.8 48.3 70.8 66.2 Min 0.98 73.42 1.48 265.85 293.67 Median 1.50 131.78 2.36 503.20 616.68 Max 3.95 253.14 6.98 2072.02 2195.38 Geometric Mean 1.429 132.558 2.640 576.084 673.986 Geometric CV % 36.00 33.88 40.27 60.19 60.92

TABLE 39 Individual and summary statistics of PK parameter estimates of dexmedetomidine in plasma Dose Re- T_(max) C_(max) t_(1/2) AUC_(last) AUC_(INF)_obs Cohort (ug) dose Subject ID (hr) (ng/L) (hr) (hr*ng/L) (hr*ng/L) 1 20 No 01-001 1.50 35.54 4.10 224.01 326.88 01-002 1.50 38.55 3.68 182.58 241.74 01-010 1.00 59.82 2.12 104.40 145.57 01-026 4.02 14.07 57.43 07-015 1.53 33.41 5.36 177.60 299.81 07-030 2.00 34.31 2.29 176.11 203.81 10-027 2.00 35.38 3.64 184.37 255.41 23-016 1.48 69.05 2.95 264.45 332.10 23-018 1.97 40.37 3.17 154.62 186.40 23-020 1.95 38.49 2.51 190.81 226.26 N 10 10 9 10 9 Mean 1.895 39.898 3.313 171.639 246.444 SD 0.813 15.019 1.021 57.654 63.994 CV % 42.9 37.6 30.8 33.6 26.0 Min 1.00 14.07 2.12 57.43 145.57 Median 1.74 37.02 3.17 180.09 241.74 Max 4.02 69.05 5.36 264.45 332.10 Geometric Mean 1.778 37.157 31.83 160.056 238.688 Geometric CV % 36.99 43.89 30.51 45.41 27.86 1 20 Yes 01-009 2.00 130.44 3.94 662.46 939.05 01-013 2.00 122.23 2.73 486.82 563.33 05-007 2.50 49.87 4.02 230.06 334.28 05-008 2.12 66.64 2.00 272.47 304.52 05-021 2.50 86.86 3.10 410.74 543.04 05-023 2.50 52.29 3.01 236.04 294.47 05-024 8.03 138.69 1912.52 07-028 1.83 125.70 1.81 477.73 520.36 N 8 8 7 8 7 Mean 2.935 96.589 2.946 586.103 499.866 SD 2.077 36.954 0.857 556.166 226.187 CV % 70.8 38.3 29.1 94.9 45.2 Min 1.83 49.87 1.81 230.06 294.47 Median 2.31 104.54 3.01 444.23 520.36 Max 8.03 138.69 4.02 1912.52 939.05 Geometric Mean 2.578 89.711 2.833 453.552 461.828 Geometric CV % 50.30 44.50 31.46 78.77 44.05 2 60 No 01-044 1.00 93.67 3.10 442.23 558.81 01-047 1.00 73.42 2.23 265.85 293.67 01-055 1.50 113.35 2.87 474.46 562.60 01-056 1.50 154.79 1.48 413.53 428.64 03-036 1.55 83.52 1.62 347.11 369.07 05-050 1.00 121.52 1.86 352.24 377.98 05-052 1.45 105.84 2.36 330.30 369.14 06-033 1.45 253.14 2.27 737.87 834.44 06-034 1.53 206.42 2.35 887.27 1007.71 06-041 2.07 144.27 6.98 1714.29 1882.10 06-043 1.02 186.40 2.53 748.96 877.63 07-048 0.98 201.12 2.91 874.85 1064.08 08-046 2.00 93.22 346.61 09-042 3.95 146.17 5.43 2072.02 2195.38 10-032 1.50 136.25 3.40 650.22 807.14 10-035 1.50 127.27 2.78 519.54 616.68 10-039 1.00 144.93 2.27 603.55 691.00 10-045 1.50 127.30 2.19 486.85 537.29 N 18 18 17 18 17 Mean 1.528 139.589 2.861 681.542 792.552 SD 0.689 47.223 1.381 482.593 525.000 CV % 45.1 33.8 48.3 70.8 66.2 Min 0.98 73.42 1.48 265.85 293.67 Median 1.50 131.78 2.36 503.20 616.68 Max 3.95 253.14 6.98 2072.02 2195.38 Geometric Mean 1.429 132.558 2.640 576.084 673.986 Geometric CV % 36.00 33.88 40.27 60.19 60.92

Tables 38 and 39 and FIGS. 17 and 18 illustrate that the median Tmax ranges from 1.5-2.3 hours for different dose levels. Further, exposure is increasing with increasing dose from 20 to 60 mcg in a proportional manner. The redosing of 20 mcg after 1 hr in Cohort 1 led to 2.5-fold increase in the geometric mean of Cmax and in AUC.

FIGS. 19 and 20 show that in Cohort 3, a 120 mcg dose resulted in a significant decrease in the PEC Score, compared with pooled placebo group. Notably, the decrease in PEC Score in 120 mcg is differentiated from the pooled placebo group at 0.5 hr and is maintained throughout the course of the measurement (6 hr).

Example 8: Clinical Study of the Efficacy (Sedation and Anti-Agitation), Pharmacokinetics and Safety of Dexmedetomidine Infused Intravenously in Subjects Suffering from Schizophrenia

A Key Objective of the study was to determine the optimal intravenous (IV) dose of dexmedetomidine hydrochloride in the target population in terms of efficacy and safety to achieve arousable sedation (RASS of −1) which can be reversed by verbal stimulation. When this goal was achieved in each participant, the IV infusion of dexmedetomidine hydrochloride ceased. Another Key Objective of the study was to determine the reduction in the level of agitation, as determined by their PEC score, at the doses to achieve a RASS of −1.

In addition, the following Secondary Objectives were:

Determine how rapidly the drug can be administered up to the total dose needed to achieve RASS−1.

Determine how long the calming effect persists after discontinuation of study drug administration.

Determine whether any adverse effects on blood pressure, heart rate, or respiratory drive occurs before or coincident with the achievement of Primary Objective. Stopping rules for blood pressure and heart rate, indicating a clinically significant event, are:

drop in systolic BP<90 mm of Hg.

drop in diastolic BP<60 mm of Hg

drop below 50 beats per minute

Participants were provide written informed consent before any study related procedures were performed. All participants were screened for inclusion and exclusion criteria. The participants were admitted to the site at screening (Day −1), the day before the infusion. Baseline assessments were performed on Day −1, as well as on the day of infusion (Day 1). The participants were on Day 1 prepared for the infusion, infused for up to 3 hours and monitored for resolution of sedation and any decreases in blood pressure or heart rate which met stopping criteria. The participants were not discharged from the research unit until three hours after resolution of any reduction in the level of arousal (e.g., RASS−1) and/or resolution of any decrease in blood pressure or heart rate meeting stopping criteria. The Principal Investigator had discretion to keep the participant overnight at the site the evening of Day 1 for extended monitoring and then discharge home the participant on Day 2 if the Principal Investigator or designee determined that the participant has returned to their baseline state.

The study population included 14 participants, 10 active and 4 placebo. Patients 5, 7, 8 and 9 received placebo. Patients 1, 2, 3, 4, 11, 12, 14, 16, 17, 18 were infused with intravenous dexmedetomidine hydrochloride, starting at a rate of 0.2 mcg/kg/hr, and rising by 0.1 mcg/kg/hr every 30 minutes until stopping criteria were reached up or to a maximum duration of 3 hours. Participants randomized to placebo received a matching intravenous infusion of placebo solution.

TABLE 40 Study Treatments Treatment Formulation Frequency Dexmedetomidine Precedex ® Continuous infusion, increment hydrochloride every 30 minutes Placebo Normal Saline Continuous infusion

Once the participant was drowsy (RASS−1), the infusion was stopped. The maximum total dose administered was 1.6 mcg/kg/hr, when either the desired level of sedation was achieved or the maximum allowable decrease in either systolic or diastolic blood pressure or heart rate occurred.

The participants were continuously monitored during the study by the site personnel, including monitoring blood pressure and heart rate. Intermittent electrocardiograms were taken from the start of the infusion through resolution of the sedation and/or any adverse effects on blood pressure or heart rate.

Whenever the above stopping criteria was met, the site stopped the infusion and the site continued to monitor the participant's vital signs every 15 minutes until the participant has reached their baseline parameters or in the judgment of the principal investigator the participant has reached a stable and acceptable level of blood pressure and heart rate. Return to baseline parameters is defined as BP falling within 15 mm of Hg of baseline reading prior to drug administration or HR falling within 10 beats per minute of baseline reading prior to drug administration.

In the event the investigator deemed the fall in blood pressure or heart rate to be clinically significant, suitable remedial drugs could be administered in addition to termination of the dexmedetomidine hydrochloride infusion, based on investigator's judgement.

Adverse events (AEs), including serious adverse events (SAEs), were assessed, recorded, and reported in accordance with FDA guidance. Should any SAE occur, the study would be stopped until a cause for the SAE was determined.

Efficacy Assessment:

(1) Richmond Agitation Sedation Scale (RASS): The desired endpoint was how rapidly drowsiness (RASS−1) could be achieved without causing changes in heart rate or blood pressure greater than that specified by the protocol. The study also monitored how long the participant remained at that level of sedation; sedation was considered resolved when the participant was awake and spontaneously responding.

(2) PANSS: Change from baseline for mildly agitated patients

(3) Clinical Global Impression of Improvement (CGI-I) (National Institute of Mental Health 1976) ranging from 1 (very much improved) to 7 (very much worse) compared with baseline. Each participant was rated, based on the severity of agitation, at 15 and 30 minutes for every dose infusion, at the endpoint, and at the time the participant returned to baseline (in terms of level of arousal). CGI-I focused on the severity of agitation rather than the severity of the illness.

(4) After the infusion was stopped, the participants were judged for the suitability for discharge by the principal investigator or designee as witnessed by a return to their baseline level of alertness and awareness with no impairment in balance, gait, and reaction time as determined by the principal investigator or designee.

Results (A) Efficacy Study RASS (Richmond Agitation-Sedation Scale)

9 out of 10 patients in the treatment arm (subjects 1-3, 11, 12, 14, and 16-18) achieved a RASS score of at least −1, while no patients in the placebo arm (subjects 5, and 7-9) experienced meaningful sedation (see FIG. 12 and Table 41).

TABLE 41 Depicts the RASS score of Schizophrenia patients receiving infusion of dexmedetomidine hydrochloride and normal saline RASS values after infusion start Patient No. Infusion 1 2 3 4 5 7 8 9 11 12 14 16 17 18 (minutes) T T T T P P P P T T T T T T   0  1  3  1 1 1 1 1 1  1  1  1  1  1  0  15 −2 −1  30  0  0 0 1 1 1 1  0  0  0  0  0  45  0 −1  60  0 −1 0 1 1 0 1  0  0  0  0  75 −1 −1 −1 −1  90 0 1 0 0 1  0 105 120 0 0 0 0 1 −1 135 0 150 0 0 0 1 165 180 0 0 0 1 T - treatment arm; P - placebo arm

PEC (PANSS Excitement Component)

9 out of 10 patients in the treatment arm (subjects 1-4, 11, 12, 14, 16 and 17) had agitation reduced to a minimum (as measured by a PEC score of 7 or below) (see Table 42 and FIG. 13 ).

TABLE 42 Depicts the PEC data of schizophrenia patients receiving infusion of dexmedetomidine and normal saline PEC values after infusion start Patient No. Time 1 2 3 4 5 7 8 9 11 12 14 16 17 18 (Mins) T T T T P P P P T T T T T T  0 9 16 12 9 11 12 9 13 13 13 10 10 10  15 5 13 12 9 10 12 9 13 13 13  9  9  8  30 12 10 8  9  9 8 12 11 13  6  6  7  45 11  7 8  9  8 8 12  9 10  6  6  5  60  9  6 7  8  8 8 13  9 10  5  7  75  7 7  8  8 7 11  7  8  5  5  90 7  7  9 7 11  6 105 7  8  8 7 10  5 120 7  8  8 7 10 135 7  8  7 7  9 150  8  7 7  9 165  8  8 7  9 180  8  8 7 10 T - treatment arm; P - placebo arm

(B) Pharmacokinetic Study: (PK Study)

The level of dexmedetomidine in the plasma of patients was also measured over the time of infusion. The results are tabulated in Table 43. The maximum dexmedetomidine concentrations in schizophrenic patients (C_(max)) ranged from about 22.45 μg/ml to about 406.3 μg/ml. Time to reach C_(max) ranged from about 15 minutes to about 105 minutes. Mean infusion rate is 0.36 mcg/kg/hr with the maximum rate ranging from about 0.2 mcg/kg/hr to about 0.6 mcg/kg/hr (see FIGS. 14, 15 and 16 ).

TABLE 43 depicts the plasma concentrations (pg/mL) of schizophrenia patients at different timepoints during the infusion of dexmedetomidine hydrochloride and normal saline Plasma level concentration (picogram/ml) 1 2 3 4 5 7 8 9 11 12 14 16 17 18 Time (Mins) T T T T P P P P T T T T T T   0 BLQ BLQ BLQ BLQ BLQ BLQ BLQ BLQ BLQ BLQ BLQ BLQ BLQ  15 22.45 BLQ BLQ BLQ BLQ BLQ 41.01 BLQ BLQ 2.56 15.87 48.36  30 14.72 BLQ BLQ BLQ BLQ BLQ BLQ BLQ 62.91 44.87 52.66 15.59 BLQ 54.53  45 BLQ BLQ BLQ BLQ BLQ BLQ 124.07 50.51 46.53 41.17 39.93  60 BLQ BLQ BLQ BLQ BLQ 150.47 108.6 406.3 67.88  75 BLQ BLQ BLQ BLQ BLQ 158.54 72.26  90 44.3 BLQ BLQ BLQ BLQ 237.83 105 BLQ BLQ BLQ BLQ 267.3 120 BLQ BLQ BLQ BLQ 135 BLQ BLQ BLQ BLQ 150 BLQ BLQ BLQ BLQ 165 BLQ BLQ BLQ BLQ 180 BLQ BLQ BLQ BLQ Total duration 19 75 60 149 180 180 180 179 68 103 64 66 36 30 of infusion (Mins) *BLQ-below limit of quantification T-Treatment; P-Placebo

Discussion: The administration of dexmedetomidine hydrochloride by the IV route produced a >=50% reduction in PEC score in a total of 7 of 10 subjects, with one subject (Patient 1) responding at a C_(max) of 22 μg/mL. 5 of 10 subjects (Patients 1, 2, 3, 16 and 17) exhibited a 40% reduction in PEC score at a C_(max) of =<72 μg/mL. The good response rates at these plasma exposure levels indicates that sublingual dexmedetomidine hydrochloride administration at similar or higher C_(max) exposure levels will achieve good anti-agitation effects. As demonstrated in Example 6 above, sublingual dexmedetomidine hydrochloride administered to healthy volunteers produced good plasma exposure levels at doses of 10, 20 and 40 micrograms, indicating that such doses would be suitable for obtaining good anti-agitation effects (e.g. as measured by a reduction in PEC score) in agitated subjects, including subjects with schizophrenia, without also producing clinically meaningful detrimental effects on blood pressure and/or heart rate. 

What is claimed is:
 1. An oromucosal formulation comprising: dexmedetomidine or a pharmaceutically acceptable salt thereof; and at least one water-soluble polymer; wherein the at least one water-soluble polymer is selected from the group consisting of hydroxypropyl cellulose, hydroxypropyl methylcellulose, hydroxyethyl cellulose, carboxy methylcellulose, methylcellulose, polyethylene oxide (PEO), and mixtures thereof; and wherein the oromucosal formulation provides at least 45.6% bioavailability when administered to an oral mucosa of an animal subject that is a male New Zealand White Oryctolagus cuniculus with an initial body weight between 2.9 kg and 3.9 kg.
 2. The oromucosal formulation of claim 1, wherein the oromucosal formulation provides at least 52.2% bioavailability when administered to the animal subject.
 3. The oromucosal formulation of claim 1, wherein the oromucosal formulation provides at least 63.4% bioavailability when administered to the animal subject.
 4. The oromucosal formulation of claim 1, wherein the oromucosal formulation provides at least 70.5% bioavailability when administered to the animal subject.
 5. The oromucosal formulation of claim 1, wherein the oromucosal formulation provides a C_(max)/dose ratio no lower than 0.119 [(ng/mL)/(μg/kg)] in more than 50% of the animal subjects.
 6. The oromucosal formulation of claim 1, wherein the oromucosal formulation provides a C_(max)/dose ratio no lower than 0.119 [(ng/mL)/(μg/kg)] in at least 75% of the animal subjects.
 7. The oromucosal formulation of claim 1, wherein the oromucosal formulation provides a C_(max)/dose ratio no lower than 0.119 [(ng/mL)/(μg/kg)].
 8. A method of treating agitation in a human patient comprising administering to the human patient an oromucosal formulation; wherein the oromucosal formulation comprises an effective amount of dexmedetomidine or a pharmaceutically acceptable salt thereof and at least one water-soluble polymer; wherein the at least one water-soluble polymer is selected from the group consisting of hydroxypropyl cellulose, hydroxypropyl methylcellulose, hydroxyethyl cellulose, carboxy methylcellulose, methylcellulose, polyethylene oxide (PEO), and mixtures thereof; and wherein the oromucosal formulation provides at least 45.6% bioavailability when administered to an oral mucosa of an animal subject with a body-weight adjusted dose, wherein the animal subject is a male New Zealand White Oryctolagus cuniculus with an initial body weight between 2.9 kg and 3.9 kg.
 9. The method of claim 8, wherein the oromucosal formulation provides at least 52.2% bioavailability when administered to the animal subject.
 10. The method of claim 8, wherein the oromucosal formulation provides at least 63.4% bioavailability when administered to the animal subject.
 11. The method of claim 8, wherein the oromucosal formulation provides at least 70.5% bioavailability when administered to the animal subject.
 12. The method of claim 8, wherein the oromucosal formulation provides a C_(max)/dose ratio no lower than 0.119 [(ng/mL)/(μg/kg)] in more than 50% of the animal subjects.
 13. The method of claim 8, wherein the oromucosal formulation provides a C_(max)/dose ratio no lower than 0.119 [(ng/mL)/(μg/kg)] in at least 75% of the animal subjects.
 14. The method of claim 8, wherein the oromucosal formulation provides a C_(max)/dose ratio no lower than 0.119 [(ng/mL)/(μg/kg)]. 